Instructables

Make your own glue

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Step 2: Water resistant glue

Picture of Water resistant glue
This glue can be used for glass, ceramics, porcelain or metal. It worked beautifully when I made coasters by gluing cork (left over from the floor) to sample porcelain tiles, and for gluing aluminum foil to cardboard for a Halloween costume -- this glue can adhere to non porous materials, unlike the flour paste in the previous step. I also tried repairing a broken mug with it but it fell apart when I filled it with hot tea -- this glue is somewhat waterproof, but not heat resistant. You can fix a plate with it, but do not put that plate in the dishwasher or microwave. 

Ingredients:
1 pack unflavored gelatin
3 1/2 tsp water
2 tsp skim milk

In a small cup pour gelatin over cold water to soften.
Boil milk (a few seconds in the microwave will do the trick) then mix it into the wet gelatin and stir till all the lumps have dissolved.

Adhesion works best when this is applied hot. If it is too runny for the surface you are gluing, let it to cool down and gel before you paint it on. 

Store in a small covered jar for a few days. Warm over a pan of hot water before use.
 
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enisdogru3 years ago
It's not waterproof.I tried.
belsey (author)  enisdogru3 years ago
I tried it too, but for an item which required water resistance -- I didn't soak it in water for any length of time, so I believe you if you say it isn't water PROOF. I'll revise the heading and call is water RESISTANT instead. Thanks for the feedback!
I don't know why you would put milk in it, but gelatin works with the same principle as hide glue. It isn't waterproof, but it is heat resistant. Hot water is likely your problem.

Hide glue works by dehydration. As the water in it evaporates it pulls whatever it's sticking to together. If you rehydrate it, obviously it will fall apart again. Of course in most cases it will need to soak a while, or be steamed, which is likely what happened to the coffee mug if it wasn't the milk.
Milk is used for waterproofing but did anyone try to do it?
Is that strong enough for water resistance?
belsey (author)  TragicSnowfall3 years ago
I believe it's the milk which make this glue waterproof: cassein molecules are hydrophobic, so they repel the water and prevent the gelatin from absorbing moisture and loosing its adhesive power.
On the other hand, heating up this glue softens it, so it follows logically that it's the heat which made the cup fall apart. Of course water might have contributed to weakening it, but my guess is it would come apart in the microwave oven too. Next time I break a mug I'll test that theory.
To be fair, I wouldn't recommend drinking out of a broken mug anyway. If the sealant is cracked it could potentially release chemicals that may not exactly be healthy. Just a heads up.

Of course if the sealer isn't cracked, by all means, have at it.
Will ants eat my glue? Just making sure they wouldn't bite me. Anyways it is good stuff dude.