Composimold reusable mold making material

mold making materials

How to choose a mold making material

After spending time with the Composimold reusable mold making material, I knew this was something that Resin Obsession customers would love to add to their mold making and casting arsenal.  Here’s a few of my impressions to help you decide whether or not the product is right for what you want to do:

1.  If you are new to casting, this is a great product to start with.  Silicone mold making materials are much more expensive and not very forgiving of mistakes.  If you make a mistake with Composimold, simply remelt it!

2.  Also good for newbies, you don’t have any thing to measure and mix when using Composimold.  Simply melt the product in your microwave and pour over your model in a casting box.

3.  Composimold molds also generally ‘cure’ faster than silicone molds.  It’s possible that you can have a solidified mold to use in as little as 30 minutes.

4.  If you have an item that you only want to cast a couple of times, I think this is an ideal product.  You can easily remelt and reuse the mold once you are done.  **Note:  once you use the material to cast something other than food, do not use it for food again.**

5.  If you have a complicated casting, or a casting that you want to have for an extended period, I would expect you would get more castings from a silicone mold.

6.  Shore hardness for Composimold is much lower than silicone.  If you have to pull hard on a mold made with Composimold, you are going to tear it.

7.  Elasticity for Composimold is also not as much as for silicone molds, making it more likely that you will tear a mold when demolding a casting.

8.  Molds made with this product are also not heat safe.  You will need to use a silicone based product if you the mold is going to be exposed to temperatures greater than 135F.

What other questions do you have about using Composimold?


Unpublished Blog Posts of Resin Obsession, LLC © 2015 Resin Obsession, LLC

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Do I have to use a mold release (haven’t really looked into that, no idea yet where I could get it in Germany.)

Do the pieces come out shiny so they won’t have tombe glazed?

I would like to try and make molds for earrings and pendants, but have given up on glazing. I’ve ruined too many pieces.



Thanks for your answer!

Never seen a non stick cooking spray over here 😀 Wouldn’t know any supermarket who,carries it. We di it the old fashioned way by just using a brush or kitchenpaper for baking.

Hm. I might have tomtry this in the future.



Hi, thanks for this post! Very informative. I still have a couple of questions though:
– is it flexible once hardened? Can I pop out the casting once done?
– will it work with UV resin under UV lights?
thanks again!

Katherine Swift

Yes it is flexible once finished. You should be able to pop out a casting without any troubles. I have not used it with UV resin and can’t make a recommendation on whether or not it would work.


Do you know if it’s safe to run under water to rinse it off? I made a mold and used UV resin with it but after I took out the casting the ComposiMold was sticky and appears to be degrading… maybe I should just cut off the part that came in contact with the UV resin. I don’t plan to use it for the same casting but I would like to save and reuse the material :/


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