How To Make a Brush‑On Mold with a Lightweight Support

Construct a mold box and secure with drywall screws. Use a razor knife to trim the rubber. Sharp clean edges will help the rubber mold register with the support shell. Center the mold box over the mold and seal all seams with hot melt glue. Apply a liberal coat of Sonite Wax® to the entire surface of the mold, baseboard, and mold box.

Use a piece of melamine board to completely cover the mold opening. This will minimize voids in the foam with back pressure. Using a ¾” (2 cm) drill bit, drill 2 holes in the board spaced a few inches/cm apart. Next, apply a liberal coat of Sonite Wax.