Tips for Successful Resin Casting with Simple Silicone Molds
Cathy Harrison
Getting great results with wood and resin starts with using the right materials and following a few simple steps. We've spent time experimenting with different materials and techniques, and here are our recommendations for getting the best results from your silicone molds.
1. Choose the Right Resin
We recommend using epoxy resin only. Our preference is TotalBoat TableTop Epoxy Resin, which we've had good results with. We have not tested our molds with urethane resin and cannot recommend its use.
2. Use a Pressure Pot to Eliminate Air Bubbles
For the best results, we recommend using a pressure pot to remove air bubbles from your resin casting. Allow at least 4 hours under pressure, or overnight, depending on the epoxy resin you're using and its curing time. Always follow the resin manufacturer's pressure and curing recommendations.
3. Make Demolding Easy with an Air Gun
Once your resin has completely cured, use an air gun with a soft, non-sharp tip to help release your casting. Gently direct a little air between the mold wall and the cured piece. The air should help separate the silicone from the casting, allowing the piece to slide right out.
Be sure your air gun tip is not sharp or pointed, as it could puncture or damage your mold.
4. Use Dry Wood for Better Results
Dried wood scraps are ideal for resin casting. Moisture in wood can interfere with resin results, so starting with properly dried material is important.
If you're working with punky or softer wood, we suggest using our SSCF Mini when turning your project.
5. Add Color with Mica Powders
Want to add some color to your resin? We've had excellent results using mica powders to tint epoxy resin. They offer a beautiful range of colors and effects, making it easy to create unique accents and eye-catching combinations with natural wood.
6. Always Use Tailstock Support When Possible
Safety should always come first when woodturning. We recommend using tailstock support whenever possible to help keep your project secure while turning. This is especially important when working with resin castings and wood combinations. Our new "Centering Cones" work great with tailstock support.
7. Give Your Project a Beautiful, Durable Finish
For finishing, we like to use a clear coat of epoxy resin, Waterlox, or a similar finish.
We've found that a thin clear resin coating can fill small surface imperfections and leave a beautiful, durable finish. If your project is intended for food contact, be sure the specific finish you choose is rated for that intended use and follow its application and curing instructions.
8. Keep Your Silicone Mold Clean
After use, wipe your mold clean with Simple Green and a clean rag. Keeping your mold free of leftover resin and debris helps maintain its condition and prepares it for your next casting.
A Note About Resin Compatibility: Our silicone molds have not been tested with urethane resin. We use and recommend epoxy resin only.