First and foremost this is my first time working with epoxy! With that said I'm making some charcuterie boards and filling small voids. One of the boards had a huge knot and it had to be removed. You can see in the pic how big the hole is. My question is what do I need to do/use to cover the bottom of the hole so the epoxy won't leak out? I'm going to put small bead of glue with hot glue gun around the top. I'm also going to color it black. What is best to use mica powder or the liquid dye?. The name of the epoxy is clear pour epoxy resin. Something ordered of Amazon. Don't know if that makes difference. Thanks in advance