Resin Sticking to Your Molds? 7 Easy Tips


It’s frustrating when resin doesn’t come out of the mold easily. You spend all that time and effort, only to have the resin sticking to the mold and making it difficult to remove. So why does this happen? In this blog post, we will explore some of the reasons for resin sticking to molds and provide some tips for avoiding this issue.


Your resin may be too hot. If resin is too hot, it can cause it to stick to the mold. The ideal temperature for resin is between 70-80 degrees Fahrenheit. If your resin is hotter than this, it can cause it to warp or deform. This can then cause the resin to stick to the mold.

To avoid resin sticking due to heat, make sure you check the temperature of your resin before using it. You can use a digital thermometer to get an accurate reading. If the resin is too hot, let it cool down before using it.

Curing Time

If you try to remove resin from the mold too soon, it will still be in the curing process and will be very soft and sticky. It’s important to wait until the resin is fully cured before removing it from the mold. The curing time will vary depending on the resin you are using.

To avoid resin sticking to your mold, consult the resin manufacturer’s instructions for cure times. Once the resin is fully cured, it should pop right out of the mold with no problem.

Demolding Spray

If you don’t use a release agent, your resin will probably stick to the mold! A release agent helps to create a barrier between the resin and the mold so that they don’t stick together.

There are many different types of release agents available on the market. You can choose one that is specifically designed for resin casting or go with a more general-purpose product. Whichever type you choose, make sure you follow the manufacturer’s instructions for application.

Not Using the Right Kind of Mold

Some molds are not made for resin casting and will not release the resin properly. This is often the case with molds that are made for soap. If you use a mold that is not made for resin, it is likely that you will find your resin sticking to it.

To avoid this issue, make sure you use a mold that is specifically designed for resin casting. There are many different types of molds available, so you should be able to find one that suits your needs.

Your Mold is Old

If you’ve been using the same mold for a long time, it may be starting to degrade. This can cause the resin to stick to the mold and make it difficult to remove.

To avoid this issue, inspect your mold before each use. If you see any signs of degradation, such as cracks or chips, replace the mold.

Improperly Mixed Resin

If your resin is not properly mixed, it can cause it to stick to the mold. Resin needs to be mixed thoroughly in order to ensure that it cures properly. If it’s not mixed properly, you’ll find your resin sticking to the insides of the mold.

To avoid this issue, make sure you mix your resin according to the manufacturer’s instructions. Use a stir stick or mixing spoon to ensure that the resin is thoroughly mixed before using it.

Pay attention to the ratio of resin to hardener recommended by the resin manufacturer. Most are one part resin to one part hardener, but one well known brand recommends 2:1 resin to hardener for some of their products.

Your Torch Damaged the Mold

If you use a torch to remove bubbles from your resin, be careful not to overdo it. If you hold the flame too close to the mold, it can damage the surface and cause the resin to stick.

To avoid this issue, hold the flame about six inches away from the resin surface. Move it slowly back and forth until all the bubbles have been removed. Alternatively, you can use a heat gun to remove the bubbles. Just be sure not to hold it too close to the resin or you could damage the mold.


With these tips, you can avoid resin sticking to your molds and have a successful casting experience. To sum it up:

  • Temperature: make sure your resin is as close to 78 degrees as possible. If it’s too cold, you can always warm it in a warm water bath.
  • Curing time: resin that is not fully cured tends to stick to molds.
  • Demolding spray: release agents make it much easier to demold your craft in one piece.
  • The right mold: make sure you are using a mold made for resin casting.
  • Old mold: molds can become degraded or damaged over time, so keep an eye on the quality of your molds between uses.
  • Bad mix: make sure your resin and hardener (in the case of epoxy resin) are mixed to the ratio prescribed on the bottles.
  • Heat damage: if you use a torch, hold it far enough away so it doesn’t burn your molds. A better option is to use a heat gun or a heat tool made specifically for resin crafting.
Share this story