5 Things You Can Make From Leftover Silicone




About: Innovative Projects, Diy's, Life Hacks

When I make silicone molds, I usually end up with some leftover silicone.

I purposely make a bit more silicone to avoid not having enough.

Last thing you want when making the mold is to realize that you don't have enough silicone to cover the model.

Sometimes you can save the day my making another batch of silicone, but it's not always practical, especially if you're using a fast cure silicone.

I used to pour that extra silicon onto the model to make the mold thicker. That is probably the most popular way of using the extra silicone.

Lately instead of making the mold thicker, I've been using the extra silicone to make something else.

I prepare another mold/object in case I'll have some extra silicone left.

If I don't have extra silicone, that's fine, maybe the next time.

In this Instructable, we'll have a look at 5 things you can make from leftover silicone.

If you are Interested in the video version of this Instructable and the embedded video does not appear on your mobile device, here is an alternative link

Step 1: Hot Glue Gun Mat

You can leave the extra silicone to cure in the mixing container.

Once hardened, remove and trim.

You'll en up with a mat that you can use for a hot glue gun.

Hot glue does not stick to the silicone, so it's very easy to clean any drips.

Step 2: Waterproof Matches

I covered a few matches with silicone and left them to cure.

I also covered the striker paper.

We have made simple waterproof matches.

Great thing to add to your survival kit.

Step 3: Anti-Slip Handle for Your Old Tools

I covered the handle of my screwdriver with silicone and left it to cure.

Now it has an anti-slip handle.

Step 4: Silicone Drink Coaster

I poured some silicone into a Pringles lid.

We have made a silicone coaster.

Step 5: Sink Stopper

My old sink stopper started to leak.

I cover the holes with some electrical tape and put a carton circle on top.

Step 6: Sink Stopper

I used what I had lying around - a plastic gear and an eye screw.

I attached it to the bolt so it would not move.

Then it was covered with silicone.

We have made a custom silicon sink stopper.

Thank You for taking time to read this Instructable.



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    31 Discussions

    alanjamesblairJakes workshop

    Reply 2 years ago

    Oh, and while ShakeTheFuture is right about Smooth-Sil 940 being food safe, that link is linking to another product that is not (Oomoo). Silly computers. Here's the link to that product:


    Unless my computer does the same thing. Regardless of what product you use, if it's for food, make sure it says "food safe" and read the MSDS (Material Safety Data Sheet)

    alanjamesblairJakes workshop

    Reply 2 years ago

    Important note, James: If you are doing anything that will touch food or have prolonged exposure to the human or animal/plant bodies, use the food-safe Smooth-Sil 940 or similar "food-safe" 2-part. If you are doing some other things, you can get away with using pure silicone you can find for windows most places. Clear, pure silicone. But if you are making molds that will be used on food or the body (cake topper molds, watchbands, etc.) don't go cheep. And never, ever make your own naughty toys.

    doug henderson

    2 years ago

    Great ideas! I've made silicone molds for nearly 30 years and I've wasted my fair share of excess. Thank you for sharing. I'll use these for sure.

    You might find this tip helpful:

    Silicone doesn't stick to much. Sticks to itself and glass mostly. But most people don't know that it bonds to shellac. So if you want a permanent bond (to many surfaces), coat the area with shellac first.

    This works with silicone caulk too.

    And speaking of silicone caulk: If you've ever squirted a thick amount of caulk onto something and it took for ever to cure, it's because it needs moisture. Once the surface dries, it seals off the rest of the silicone from ambient moisture.
    But you can mix in a little acrylic paint in to catalyze the silicone. I just squirt silicone into a cup and stir the acrylic into it. Takes very little. Too much acrylic can make it set too fast and makes the final product more brittle.

    Always to do tests before committing to a Lyn important project.

    I hope this is useful info. Happy Instructables!

    3 replies
    doug hendersondoug henderson

    Reply 2 years ago

    I have no idea what a "Lyn" project is. :/ I meant to say "important".

    Spellcheck is my worst enema.


    2 years ago

    Good idea - the sink stopper. I have been bemoaning the fact that ever
    since I bought a new sink years ago, the company who sold it to me (or
    anyone else) could not offer a replacement stopper rubber that fits

    1 reply

    Reply 2 years ago

    I also had a similar problem.

    I bought 2 universal sink stoppers, but they were leaking.

    That's why I used leftover silicone to make my own.


    2 years ago



    2 years ago

    Have you tested your waterproof matches? What if they are soaked through the wood?

    Great uses for a "waste" product!

    2 replies

    Reply 2 years ago

    I tasted, but only for a short period of time.

    You can always cover the whole match to make it fail proof.


    Reply 2 years ago

    Was it delicious? ;o) Just thought it was a funny slip. Good instructable. Do you have one where you explain about the kind of silicone and some of the molds you use it for?


    2 years ago

    When I have leftover silicone I allow it to harden and then place it in the bottom of the next mold i I pour. Silicone will stick to silicone.

    1 reply