In this post you will find details for material and instructions to make silicone molds using silicone rubber mold making kit. This is a one stop article to get you started into making silicone mold for casting epoxy resin projects, candle wax, soap, plaster, concrete cement, clay and more.
Table of contents:
- Silicone molds making video
- Make silicone mold
- Important information
- Silicone molds step-by-step instructions
- Silicone mold tips
- Ways to make silicone molds frame
- Materials to use as master mold for silicone rubber
wear gloves, cover the surface, place your non-silicone item you want to make mold of in a tray and seal from the sides. Mix part A and part B of the silicone rubber mold making kit using wooden stick and pour over the item till it’s completely submerged in it. Let it cure as per instructions in the product’s manual. Trim and remove the item and use your mold to make variety of things using epoxy resin and other casting crafts.
Silicone molds making video
If you are a visual person you will enjoy this video of making silicone molds from mixing till removing the item from the mold to making an epoxy resin soap dish.
Make Silicone mold
You can make a mold using anything in silicone, for the purpose of this tutorial we are using a dollar store soap dish.
You will need:
- Lets Resin Silicone Rubber
- Lets Resin Mold Housing for silicone mold making
- Plastic or paper sheet
- Baking tray
- Parchment paper
- Double-sided tape or glue gun
- Wooden sticks
- Plastic cups with measurement scale
Before starting the process let me share some importance essential features of the Lets Resin silicone rubber product I chose for making silicone mold art and crafts.
Features: This is a 30A hardness, self-degassing and fast curing platinum silicone with high tear strength, resistance and low shrinkage rate. It is non-toxic, odorless and doesn’t easily break making it ideal for DIY resin molds. Note that: A platinum cured silicone uses platinum as a catalyst and converts from liquid to solid using heat from the environment.
Mix Ratio: 1:1 by weight or volume (weight is more accurate)
Mixing Time: 3-5 minutes for smaller quantity or till the two solutions mix completely. One is blue and the other is white making it easy to notice proper mixing.
Working Time: 30 minutes at room temperature i.e. 25 °C/77 °F.
Curing Time: Approx 3-6 hours. Depends on the size and thickness of the project and curing temperature. I waited for 24 hours before remolding and using the silicone molds for making projects.
Bubbles: Low viscosity helps bubbles disappear within 2 hours at room temperature. If you are working in hot temperature, you can seal and put it in the refrigerator for 1 hour while it cures to remove any possible micro bubbles formation. Remove and continue to let it cure at room temperature.
Use: Make small and large silicone rubber molds for wide application. They are ideal for use as resin casting molds, 3D silicone molds, concrete molds, cement molds, soap molds, plaster molds, clay molds and more. It has a long life and are reusable up to 500-1000 times.
Silicone molds step-by-step instructions
1. Wear gloves and cover the working surface with a plastic sheet or any sheet you prefer to avoid mess from spills.
2. Plastic, metal and any non-silicone material can be used for making silicone molds. I used a parchment paper as base for my project and placed it in on a baking tray.
3. Then I placed the item I want to make mold off on the paper i.e. the soap dish. If the item is lightweight make sure to fix it to the base using double-sided tape, otherwise it may float to the surface making the process ineffective.
4. Create a boundary around the soap dish.
The mold housing is a convenient accessory to make small molds and you can build in a variety of shapes. Use double-sided tape to stick the mold housing to the parchment paper and seal it with glue gun for extra prevention. I skipped the glue gun part but firmly pushed it down, however, some small quantities escaped the sides but didn’t cause much trouble.
5. Once the setup is complete mix the silicone rubber in equal parts.
To avoid accidents be careful with the measurement. Ideally use a scale to measure by weight but since I didn’t have a small scale I aligned my eyes with the measuring cup and poured equal quantities of silicone A (white rubber) and B (blue rubber) one after the other. Use a wooden stick to mix the two entirely for at least 3-5 minutes or till there is no difference between the two colors.
6. Pour the mixture into the housing till 1/4 of the soap dish is covered with silicone. There is a chance of silicone mold ripping if it is too thin at the top.
7. Let it cure for 5-6 hours as suggested by the manufacturer. I left it for 24 hours just to be sure.
8. After it cures. Remove the mold housing from the sides and remove the parchment paper from the bottom. Now carefully cut the top to remove thin layer using scissors and remove the soap dish.
9. Trim the details to make it neat and ready for casting.
10. Make your projects. Find detailed instructions and video on epoxy resin molds DIY.
Silicone mold tips:
- Always seal the solution bottles after pouring.
- You get more working time with silicone in lower temperature.
- Silicone spills easily wipe off the surface with rubbing alcohol and clean with soapy water.
- Bring the silicone at room temperature before using if it has frozen.
- You can reduce the stickiness of silicone by leaving it to cure for 1-3 days. Can happen with larger projects. I personally didn’t have this issue.
- To avoid cure inhibition make sure to work in a clean environment and avoid contact with resin, clay and tin-cure silicone. (Tin cure silicone uses tin salts as catalyst and moisture from air to transform).
- Avoid water contact while making silicone molds and wipe things with paper towel to dry completely before use.
Ways to make silicone molds frame
There are a variety of things you can use at home to make frame for pouring silicone rubber to make molds other than adjustable size mold housing.
For the boundary: Use lego bricks, cookie cutters, plastic cups, foil trays, cardboard cookie boxes, and plastic chocolate containers.
For the base: PVC sheet, seamless tape, ABS plastic sheet, PLA sheet, and acrylic plate. Make sure to seal the bottom and boundary with hot glue gun from the outside. Do not use silicone mat as base.
Materials to use as master mold for silicone rubber
There are a variety of items you can use to make molds with silicone rubber that are non-silicone. A few of these items are:
- epoxy resin cured pieces
- metal items made of copper, iron, steel, and aluminum alloy.
- sulfur-free clay (like air dry clay, polymer clay)
- 3D model items made of PLA and ABS material.
I hope you found this article useful. If you have any questions regarding the projects I have shared please leave them in the comments section below. You will also like:
Disclaimer: This is a sponsored post by Lets Resin. I received products for review, however, the opinions and projects shared are 100% mine.