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Use and maintenance of Silicone Molds - 10 Practical Tips

You naturally want to use your silicone molds for epoxy, plaster and jasmonite for as long as possible. Here are some practical tips from our experts.

use and maintenance of silicone molds


There are many types of molds. Large and small silicone molds for epoxy, jasmonite or plaster. These molds are often used for making decorations, jewelry, key chains and other art making.

More than 250 different silicone molds can be found here: silicone molds . These molds are made of high-quality silicone and are therefore often reusable.
Are you going to pour epoxy into a mold? Always use a good quality epoxy such as the UV Resin - Jewelry Epoxy resin or 1:1 Epoxy casting resin .

1. Please check the mold before use

There may be rough edges on the inside of a new silicone mold that have not been completely removed at the factory. Before using a (new) silicone mold, it is always advisable to clean it thoroughly.

Have you used a mold before? Then remove the excess epoxy first. This can be done using a wooden stick or a spatula. However, make sure you don't apply too much pressure or the mold may be damaged.

2. How do you get a deformed silicone mold back into shape?

Silicone molds for epoxy or bakeware are (fortunately) very flexible. The thinner the mold, the more flexible. The disadvantage is that such a flexible silicone mold will also deform more quickly due to the mass of the epoxy, careless storage, etc. During shipping, molds can sometimes be a bit deformed or bent.
Before casting, first check whether your mold is neatly straight in shape. You can wring and squeeze a deformed silicone mold a bit to get it back into shape. If this does not work, you can try to reform the mold by placing a heavy object in it or turning it over. A third option is to tape the silicone mold to your work table.

3. How do you clean a silicone mold?

Immediately clean the silicone mold thoroughly after each casting with a mild soapy solution, such as dishwashing liquid and warm water. Most silicone epoxy molds are resistant up to 250 degrees. Never use steel wool or scouring pads, as these can damage the silicone mold. The scratches that appear in the mold are then visible in your end result.

Then pat the mold dry with clean kitchen paper or toilet paper.

cleaning silicone mold

    4. How to remove glitter and powder from a silicone mold

    You can complete your creation with glitter or pigment powder , but they often stick to a silicone mold. To remove the remaining glitter you will need a piece of tape, masking tape or a clothes roller. Simply move the sticky part over the mold and all the glitter will stick to the sticky part.

    glitter cleaning silicone mold

    5. What is the best way to store silicone molds?

    It is best to store silicone molds dust-free. You can choose to put the mold back in the zipper bag it came in. But you can also wrap the mold in plastic foil. The most important thing is that no dust is added.

    You can then store all the molds you have in a plastic box. Store the molds on a flat surface, otherwise the mold may deform.

    clean and store silicone mold


    6. How to remove epoxy air bubbles?

    Air bubbles can form when working with epoxy. Many customers remove these with a lighter or gas burner. This sometimes works, but be careful. The epoxy is flammable with too much heat and if you get too close to the edges of the mold with your torch it will damage the mold because the epoxy will stick to the mold and this will cause your mold to rub.

    Tips to remove epoxy air bubbles

    • The best way to remove air bubbles from epoxy is to let it rest for a few minutes after mixing and stirring the epoxy, then most epoxy air bubbles will burst. Even after pouring into the mold itself, it is best to wait a while, then most air bubbles will burst automatically.
    • Heat the epoxy in a bain-marie for a few minutes: no warmer than 40 degrees Celsius.
    • Spray your creation with the Bubble Blaster spray and the air bubbles will burst after a few seconds. Don't do this too often because you can get a haze on your creation.
    • If you want to take a professional approach, you can opt for a vacuum chamber or pressure vessel.

    7. Safely remove your artwork from a silicone mold

    After casting, carefully remove your creation from the silicone mold. Always do this gently: first loosen the edge and then remove the entire silicone mold. Do not stretch your mold too much during removal, as this will cause the silicone to stretch, causing the mold to become dull or cracked. This shortens the life of the silicone mold. Epoxy molds can last a long time if used properly.

    8. The epoxy is stuck to the mold

    If there is epoxy or plaster stuck in the mold, place it in the freezer for 30-60 minutes. This can't hurt and ensures that your creation comes out well. You can also try to wring your creation loose with soap and water. This works especially well with silicone molds such as rods and jars.

    9. What is the lifespan of a silicone mold?

    Unfortunately, silicone molds do not last forever. Molds are becoming increasingly vulnerable due to the use of epoxy or plaster. Some molds only last 5 times and others can be used 20 times, for example.

    The use of epoxy or plaster may cause your mold to become slightly deformed or warped. To use the silicone mold once or twice, you can stick it to a flat surface with double-sided plank tape. If the mold remains out of shape, it needs to be replaced.

    10. Pouring a silicone mold

    In order to pour properly, it is important that you know in advance how deep you can pour with the epoxy or plaster you use. This is especially important for large objects such as a vase or flower pot. This is often indicated on the product page.

    Most epoxies have the property of shrinking slightly during the curing process. For the best result, it is best to cast the mold a little fuller, creating a bulge of epoxy just above the edges of the mold. This then shrinks out nice and flat.

    More information?

    Do you have questions about making art, jewelry or casting/coating floors or other objects? Several people work at itsOkay epoxy experts each with their own expertise. We are happy to help you.

    Please contact the customer service from itsOkay or take a look at it Epoxy knowledge center .

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