Introduction: Milky Window - Makeshift Curtains

Picture of Milky Window - Makeshift Curtains

When you live on a students budget you want to spend as little as possible on rent.

In Germany the concept of dormitory isn't as common as in the US, most students here live in the city center in "shared apartment communities". That's how I lived the last few years and I'm pretty happy with my housing situation. I found a nice and inexpensive room in an apartment I share with two other students. The only downside to my room is the not-so-splendid-view: the row of houses on the opposite side of the street is awfully close and it feels like the neighbors can count the peas in my soup...

Since I'm not a fan of net curtains I used another way to establish some privacy - I "frosted" my windows in an easy (and easy removable) way. This method is pretty cost-effective (less than 50 cents per window) and it can be beautified in many ways.

I learned about this glass frosting technique from one of my flat mates. He does this curtain replacement methode since years, and I also used it now for more than two years with no troubles at all.

BTW It isn't such a crazy or very fresh idea to use milk products for painting - check out these wikipedia articles about casein paint and milk paint ;)

Step 1:

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This is a real students budget project, basically all you need is a cup of plain low fat yogurt and a sponge.

To speed up the process a paint roller will come in handy. But if you are on a tight budget and don't own a paint roller you can also use a dish-washing sponge.

If you want to cover just a part of your window it's helpful to use adhesive tape to determine the area to be painted and to get a clean finish. If you prefer to cover the whole window you won't need it.

You actually don't need huge amounts of yogurt, I think I ended up using about half a cup for the window I did for this instructable...

Surprisingly the yogurt adheres very well with the glass and doesn't roll off at all.

Step 2:

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All you have to do is to distribute the yogurt on the window.

Please note: You have to paint the side of the window that faces your room - don't do this method on the outside! The rain would wash away your curtains...

The easiest and quickest way is to use an spongy paint roller, saturate it with yogurt and apply it gently to the window. It took me about less than five minutes to do my window. It is really easy.

If you use a simple sponge it will take a little longer, but the result will be the same. Just dab the yogurt soaked sponge on the window in a steady motion.

When done applying just wait for the yogurt to dry. It depends on the temperature and humidity how long it takes to dry. I did my window on a warm and sunny day and it was dry in about 15 minutes.

As you can tell from picture no.5 the yogurt "paint" becomes more opaque when it's dry.

While the yogurt is drying you may recognize a slightly creamery like smell in your room - but as soon it's dry this slight smell will be gone.

Step 3:

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If you want to cover the window just partially like I did, I recommend using adhesive tape as guidance lines.

Just determine the area you want to cover and mark it with two long strips of tape.

Then cover the area with yogurt, covering the tape partially as well. If you accidentally dabbed across the tape just take a piece of fabric or tissue and remove the yogurt while still wet.

When you finished applying the yogurt - remove the tape and you'll end up with a crisp outline.

Step 4: Beautification Options - 1

Picture of Beautification Options - 1

There are several ways to add designs to the yogurt curtain, some of them you have to prepare before you apply the yogurt:

Adhesive foil reserving method:

You can use adhesive foil (I used adhesive foil which is originally made to cover books) and create stickers with an exacto knife. Apply those stickers to your window before you dab it with yogurt. When you carefully remove the stickers later you'll get a nice and crisp negative shape of your sticker. (I tested this method on an old glass of a picture frame, thats why you see the wooden table underneath the glass...)

Adhesive tape method:

You can also play around with strips of adhesive tape. The very first time I made a yogurt curtain I placed several stripes of tape in different widths horizontally on my window to obtain a stripy design. You could as well construct several geometric shapes...

Paintbrush method:

You can use a bristle paintbrush to obtain interesting patterns. The last two pictures show the pattern you get by dabbing the paintbrush constantly in a downwards motion. It's worth to experiment a little with different brushes and motions (you can do tests and experiments on old picture frame glasses).

Step 5: Beautification Options - 2

Picture of Beautification Options - 2

Although the dried yogurt paint sticks well to the surface of the glass - it doesn't bond like glue or real paint.

You can use a sturdy piece of plastic (like a piece of an old credit card) to scratch away parts of the yogurt. That's how I did the instructables robot design on my window.

You can either do a freehand drawing (that's how I made the dinosaur in the last picture) - or use a printed template to get more control over the outcome of the picture. I used Rasterbator to blow up the robot (there's an instructable about how to use the program) and taped the printed sheets together.

Tape your template on the outside glass and you will have nice guidance lines for where to scratch the yogurt away.The credit card scraper is hard enough to scratch the yogurt but doesn't damage the glass. Try not to touch the yogurt surface with your fingertips - the moisture of your skin may "wash away" the yogurt paint...

I really like this method, it gives your picture a drawing-like appearance.

Step 6: Remove the Curtain

Picture of Remove the Curtain

If you get bored of your window design or if you move out from your room you can easily remove your yogurt curtain. I just used warm water, a squirt of soap and a dash of ethyl alcohol. You could as well just use warm water and a windex like glass cleaner. Your curtain will be disappeared in no time.

Step 7: Pros and Cons and Variations

Picture of Pros and Cons and Variations

I hope this instructable is helpful and prevents you from taping bubble warp to your windows... :)

There are some things to note to this method - as it has it's weak sides too:

I think the yogurt curtain doesn't work well in very humid rooms. So you shouldn't use it in rooms like the bathroom where frequently condensation occurs on the windows. I suspect there's a good chance of growing mold on your curtains in such a humid environment. Though I want to point out: I lived now more than two years with my milky window curtains in a multi-functional sleeping-working-living room and there occurred absolutely no signs of mold or critters (also no smell). So for "regular" room situations it's absolutely suitable.

In general the yogurt paint connects very well to the glass and doesn't brittle or dust away over time - but the yogurt surface is relatively sensitive to touching (At the last picture of step 5 you may recognize some traces of fingertips - when I did the drawing of the dinosaur I wasn't really careful and touched the glass a lot...)

If you you are looking for a more of a long term solution you probably should go with this instructable: In this instructable acrylic paint is used - This may give you a more permanent curtain which is less sensitive to the touch - but you will have to use a blade to get rid of the paint...

Btw: the yogurt-window-frosting-method is not only useful for strange housing situations, you could also use it to frost the windows of a glass cabinet or a glass door if you want them temporarily opaque.

And another idea for a variation (I haven't tried yet) is to use watercolor or food color mixed with the yogurt. I suspect you could make colorful yogurt curtains this way....


dagaherz (author)2014-10-07

I bought a kind of plastic (that which you use to protect student's books but with frosting effect) and cut stripes to make a special design (and to save material and get more light, too) the only thing you need to add is water. And more water every couple of months, maybe, cause of the corners tend to unstuck. The cost is 0,90€ (1,14$)/roll and the time was 30 minutes (10 minutes to cut it and fix it, and 20 minutes for discussions about designs). I don't remember the roll's length, but width is enough to cover windows (with blank spaces).

I can not use yogurt because insects, with more than 40ºC (more than 105ºF) in summer. Another problem I have (as somebody mentioned) is how to keep a 30kg -66 pounds- dog (pulling like 200kg - 450 pounds) apart.

The result is acceptable, and cheap too, do not you think?

spunk (author)dagaherz2014-10-07

Your result looks quite impressive!

I'd like to encourage you to write an instructable about your method - People with pets or in very humid climate would really benefit from your way of frosting windows!

DavidG14 (author)spunk2014-10-07

thanks a lot!

'ible?... It's very simple: remove the window and stand horizontally.

Cut the plastic, get the glass wet (spray gun is an optimal option), put with a minimum taste, move to fit (easier when wet, not soaked) and let it drying (better than a hair-dryer is to forget it at night and place the window back next morning. (It is better in Spring, never do that in Winter!!)

And that's all, You got it.

mrahayu (author)DavidG142016-10-11

Will it be able to be removed? Because I couldn't use the yogurt since my place is too hot! So I want to try plastic for alternatives

metqa made it! (author)2014-11-24

I made it! I had some leftover fat free greek yogurt and said, "What the heck." My kitchen door has glass panes and at night it feels creepy so I keep the blinds shut, but in the day I want the light. So I painted the panes so you can't see through and I get to have light in the day and privacy at night. My Bedroom window also. In the kitchen window I left the middle pane clear and covered it with an oiled paper design that I can lift in order to peek out and see what's going on. I've gone on to paint the lower half of the kitchen window and might use this to decorate the front windows with Winter themes after Thanksgiving. My cat has already tried to lick a corner of it, thankfully that was a short lived curiosity. It has a nice smell as it dried which dissipated quickly.

spunk (author)metqa2015-07-14

Sorry for the late reply, I somehow missed your comment...

Your windows look great! Thanks for sharing your results!

AnneB4 (author)2015-04-03

I'm trying this tomorrow! I'm also very curious whether it would be possible to paint with it on the glass. So instead of leaving or scratching out a drawing, actually painting one with the yogurt :) Will be trying that too at some point. Thanks and greetings from Belgium!

zzbb (author)2014-10-07

Thanks, great ible. Has anyone tried thinning this down with water, etc. to let as much light in as possible?
My goal would be to gain privacy, but to still have maximum light for my overwintering plants and solar heat gain. Tried the clear "Matte Finish" spray paints, but those can peal / crack.
Hmmmm... bubble wrap...

spunk (author)zzbb2014-10-07

I guess you can water it down to a certain extend. You could do some tests on a small area of your window the next time you eat a yogurt ;)

Also, if you leave parts of your window uncovered (like the picture in the comment of dagaherz) you'll end up with more light in your room.

I'd like to hear about the results!

zzbb (author)spunk2014-10-28

Tried thinning down with vinegar, thinking the acid would make a better bond to glass. Looked perfect when wet, but the light diffracting privacy effect was gone after it dried.

thundrepance (author)zzbb2014-10-09

ha-ha! last month, my son said that he thought he might go out & buy some rolls of bubble wrap & cover all of the windows for winter! :D .... he wants to insulate, but allow the light to come in throughout the day~ :)

spunk (author)thundrepance2014-10-09

He should try cling film / saran wrap first ;)

(Friends of mine who lived in a house with single glazing windows used a plastic wrap product for insulation. The film was applied with double-faced adhesive tape to the window frame. Though it wasn't as efficient as multiple glazing it was quite an improvement...)

vseminara (author)2014-10-07

I've heard spray starch and water used for this purpose as well - find it on, no insect worries.

spunk (author)vseminara2014-10-09

This sounds very interesting. I'd like to learn more about it.

Can you give a more specific link? I took a look at the website and it's a dangerously interesting blog :) I'm afraid I'll spend the next two days reading it without finding the window treatment...

Rayjo (author)spunk2014-10-13

This seems to be the article that vseminara was talking about:

Rayjo (author)Rayjo2014-10-13

I had a more careful read of the manhattan-nest article, they used a thin bed sheet (ironed flat, so no creases), then painted with a cornstarch solution. I guess "parchment cooking paper", or Japanese decorative paper might be other good materials to use. According to the article, cornstarch is easy to remove. Doing a bit of searching myself, cornstarch does not seem to encourage bugs.

Thoroughly enjoyed reading up on alternatives to semi-permanent adhesive films. Thanks for this 'structable!

tmarx5 (author)2014-10-07

Great idea and perfect for Halloween (or other Holidays) temporary window decorations, thanks for the instructable! I'm going to try to add food coloring to make 'paint'. And I wonder if adding some "Bitter Apple" spray to the yogurt before painting (to make dogs stay away) would ruin it? I might try that, too. Dogs don't like Bitter Apple spray.

spunk (author)tmarx52014-10-07

I'd love to see your results! You should share them either with the " I made it" button - or with a Halloween-yogurt-window-decoration-Instructable on it's own!

persia111 (author)spunk2014-10-07

Wouldn't food colouring end up staining the window making it not so remeovable after all?

spunk (author)persia1112014-10-08

Since food coloring isn't capable of staining glass I wouldn't expect any trouble. But you could test it on a small area or on an old drinking glass if you are worried.

persia111 (author)spunk2014-10-13

In that case, I'd love to add colour if I do this some day :)

spunk (author)2014-10-07

I'm not at all joking.

I'm not sure the vinyl you are talking about is available here. I only know self adhesive book foil (the one I used to make the stickers in this 'ible) and I wouldn't use it to stick it for a long time to a window since sunlight and heat may make the adhesive become a mess... And the vinyl that's sold for windows is pretty pricey here.

But besides the price which may vary from country to country - I see other advantages too. I like the fact the yogurt paint can easily be varied by different designs and I think it's kind of an Eco-friendlier alternative: less petroleum wasted to produce it, less waste after usage....

Your method for sure has advantages too since it may be used in humid rooms as well, and if you have pets it may be the better solution.

BTW I'm kind of offended by your tone...

DavidG14 (author)spunk2014-10-07

If offended, sorry. Not intended at all. Just surprised about that use. And joking as you can see talking about time to do that, dog-pulling capacities,...

Yogurt??? I can not believe it yet. Do not you have armies of insects
every night? I imagine that method in countries... we can tell... around Amazonas (i.e.) and
insects will eat even the window.

Anyway I think you answered before I removed the first one... I didn't like it too, so I tried to rewrite it.

I bought that plastic in a chinese shop, it's the second most simple (accepting the most as the transparent one), but thinner than the one you talk about for windows. My oppinion is the same with adhesive, I can not imagine about removing that thing, so no way.

It is not a competition to get a winner, I can not use that method here and maybe you can not get the same conditions over there. I am pretty sure there are a lot of advantages than mentioned with both methods, like adding food colorant on yours (brilliant comment but somebody said before!). It was just another option I wanted to share... (I think my ego wanted to be famous designing frosting windows). So I asked you about your opinion, not saying mine is better.

thundrepance (author)DavidG142014-10-09

hi, david! she was offended by something rude said by "dagaherz" {not by you!:)} that's most likely the reason his remark was removed >:(

PEACE to everyone :)

dagaherz (author)thundrepance2014-10-09

thundrepance, both are the same person... But I logged-in with another account.

And it was me, too, who deleted the comment, just to rewrite it, but she read before the new one replaced it. Not offensive (at least, not my intention), but I think it could be bad understood, as occurred.

thundrepance (author)dagaherz2014-10-10


spunk (author)dagaherz2014-10-09

I'm glad it wasn't your intention.

You should stick to one account, this kind of confusing...

caraloca (author)2014-10-08

Great idea , how long can it last ?. until the yogurt goes bad ?

Thanks for sharing

spunk (author)caraloca2014-10-09

I never had yogurt curtains gone bad. The longest I waited before washing the paint away was about a year... So I'd say the "shelf life" for this method is at least one year ;) But you probably want to clean your windows more often than once a year - I confess I'm pretty lazy when it comes to window cleaning...

caraloca (author)spunk2014-10-09

thank you

RayJN (author)2014-10-08

This looks better than the emergency mylar blankets 84" x52" $5.24 (4 pack) on Amazon. But the blanket keeps out a lot of heat. Mist the window with water and it will stick to the glass tape the corners and trim with a razor blade.

spunk (author)RayJN2014-10-09

That's an interesting idea. I think emergency blankets would work especially well on skylights / roof windows in summer time!

Have you tried it? How much of the daylight gets through the foil?

You should write an instructable about it ;)

RayJN (author)spunk2014-10-09

Definitely not for show. Below is a picture from my bedroom window. The
light level at noon is a little brighter than just before sunrise
without the cover

spunk (author)RayJN2014-10-09

You have to write an 'ible about this! It's a pretty cool hack :)

LadyEz (author)2014-10-09

Fantastisch!! I get alot of mildew in my room as it is very old and damp....Do you think the yoghurt will go mouldy???

spunk (author)LadyEz2014-10-09

I absolutely wouldn't use yogurt paint in such an environment. I'm sure the yogurt would catch mold as well. I don't recommend this method for humid places.

I think you should rather use vinyl as recommended in the comments.

I hope you'll find a way to get rid of the mildew in your room. I don't think it's healthy to live in a moldy environment!

BLASTFEMI (author)2014-10-07

Yogurt curtains are the ultimate DIY for window treatments! I love it! I want to do my windows now too! Thanks for the interesting idea!

spunk (author)BLASTFEMI2014-10-09

Thank you! I hope you'll share your version, I'd love to see other peoples yogurt curtains!

wilgubeast (author)2014-10-06

I didn't know that we were looking for this project when we started the DIY Uni Contest, but now I know that we ran it to learn an unusual use for yogurt. Nicely done, beautifully documented, and your peas and soup are safe from prying eyes.

spunk (author)wilgubeast2014-10-06

I don't know why I didn't just start making cream pea soup... ;)

thundrepance (author)spunk2014-10-09

o.k. .... you totally cracked me up! :D

mommymaker (author)2014-10-07

I love this very simple idea! The only think I'm paranoid about is the yogurt spoiling. Does yogurt stop spoiling when applied this way? I'd hate to go from a frosted window to a moldy one. :)

spunk (author)mommymaker2014-10-07

I live with yogurt curtains for almost three years now and there never occurred any spoilage. No odor, no insects, no mold.

It might be a problem in super humid place where the yogurt becomes whet again. I wouldn't use it on a bathroom window. And tropical climate or monsoon time could be troublesome for your yogurt window...

Robert C Bowman (author)2014-10-07

Has anyone tried food coloring for colored "curtains"?

dorchard (author)2014-10-07

I was wondering if anyone's tried this in a very hot climate. I live in the high desert and my windows routinely get up above 100F with high levels of UV. If I can keep my cats out of it, I'll try it out and let you know how it goes.

Kinnishian (author)2014-10-07

Very impressive! All the more because you've tested it out over a long period of time already. I would have been skeptical without knowing that.

Earlier in the instructable you said something about the paint "connecting" to the glass. "Surprisingly the yogurt "connects" very well with the glass and doesn't roll off at all" I think another option could have been to use the word "adheres" and you would not need the quotation marks. If you want. The way you have it written now, also works.

spunk (author)Kinnishian2014-10-07

Thank you for the advice on the phrase, I appreciate it! I'll change the 'ible...

I really never had any trouble with mold or any kind of insects in those almost three years. (But I live in Germany - I guess in a very humid or tropical climate it could be different.)

antioch (author)2014-10-07

Supersimplenice! Thanks!

dreiduke (author)2014-10-07

geile idee, net deppat, wirklich net deppat.

spunk (author)dreiduke2014-10-07

Wow, it took me a while to get your comment... ;)

Thanks and greetings to Austria!

About This Instructable




Bio: I like to divert stuff from its intended use. Most of my crafting is based on re-use and recycling due to my urge to use ... More »
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