Mix and apply more Plasti-Paste™ as needed. Be sure to apply material beyond the edge of the silicone mold. Apply at least 3/8'' (1 cm) thickness, making sure the rubber mold is thoroughly covered. Larger molds may require added thickness for support shell stability.
Attach wooden blocks to the support shell with additional Plasti-Paste™. These blocks will help level the mold during casting and allow for easier handling. Once all the Plasti-Paste™ has fully cured (approximately 90 minutes), carefully remove the support shell from wall.