If you’re looking for a reliable and cost-effective way to create molds for your projects, consider using RTV silicone mold making material. This type of silicone is designed specifically for the purpose of creating molds that can withstand the wear and tear of repeated use. Working with RTV silicone can be easy if you follow the instructions and do the proper preparation.

Below are some tips on how to work with RTV silicone mold making material.

-The first step in working with RTV silicone is finding or building a container for the part (also known as the plug) that you will be replicating. This will ensure that the silicone will stay in place while it’s setting up. You can use any type of container as long as it’s made out of non-pourous material like a plastic container or bucket. Make sure there are no gaps or cracks in the container and that it’s sealed tightly. If you use wood, make sure it is sealed so that it is not porous.

-The container should not be much bigger than ½” or ¾” on each side of the part that will be replicated. This reduces the chance of using more silicone than necessary. Silicone is expensive so you don’t want to use too much. You can calculate how much silicone you need by-

           -Multiply width x height x depth of the container

           -Multiply width x height x depth of the plug to find it's volume

           -Subtract volume of plug from the volume of the container

           -Divide by 10 for the volume of the part B if working with a 10:1 ratio.

-Use molding clay if there are any gaps between the part and container. The clay can also be used to fill any holes or imperfections in the part being replicated.

-Use a small scale to get an exact measurement so that you don’t end up either wasting too much of the material or not having enough for the project. Use one with milligram accuracy (or better) for best results.

-Make sure to shake the bottles well before pouring. Components in the bottle can settle. It is important to make sure it is well mixed. Mix each side separately and then pour into one large cup to stir thoroughly together. It is not completely necessary to stir each part separately but it is a good precaution. Check to make sure the color is uniform before pouring into the container with the plug.

-Mixing cup can be rolled around from side to side to work out any air bubbles for several minutes.

-Pour the silicone into the container in one spot. If you do this approximately 6 inches above the container, it will help release any air bubbles that could cause defects in the final product. Do this in a slow stream. Allow the silicone to work its way around the part/plug. Tilt the container if the silicone needs a little bit of help surrounding the entire part. This will also help air bubbles work their way out.

-Wait until silicone is completely cured before releasing. It is important to be patient! This could take up to 24 hours.

-When cutting through silicone, try to be neat as possible. Do not cut through the entire side of silicone at once. Work at it slowly with a small knife. If you do this, your mold should go back together nicely after removing the part.


Working with RTV silicone mold making material can be intimidating at first. But following these tips should help make things easier for those who are looking for an easy way to achieve their desired results without compromising quality along the way! Whether you’re working on hobby projects or professional production runs alike, understanding these basic principles should put you well on your way towards creating perfect molds every time! Be sure also to work in a well-ventilated area and wear gloves as contact with skin may cause irritation. With patience and practice anyone can become proficient at working with RTV silicone materials.

If you want a step-by-step guide on using ArtiSil 1025T (formerly known as ProSil 1025) mold making silicone you can Read Here.

There is also a video you can watch of the process- Click Here

As always, if you still have questions, do not hesitate to reach out to us at sales@fiberglasswarehouse.com or 833-669-7899. We are always happy to help.

By Dallin Leach 0 comment


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