should you sand and polish any dust particles that appear on your project between layered pours. I’m using a layering technique and am finding that once the layers are cured there are particles on the surface and I don’t them to show through in the final product. Should I be sanding and polishing between every layer? Also if I’m trying to get perfect crystal clear layers to make one solid piece should I be warming the mold and putting down baby powder between each layer.