I’m struggling using silicone molds and hope someone can help me troubleshoot. I make large resin pieces so work in thin layers. Using my old plastic molds, with my epoxy resin, you would never see each individual layer. But when I switch to a same size silicone mold, and pour the same height / thickness of layers, my finished product shows every single layer. Is the silicone conducting heat differently than my plastic did? Why is this happening and what can I do to stop it?