i use devcon 2 ton epoxy to seal my pop molds.the shine of the baits from the pop molds are equal to my aluminum molds. i have a few i sealed with the elmer glue method and it worked well also.if i remember right it was elmers glue all,cut it 50/50 with water get a small soda bottle fill half way with glue top off with water shake it up real good let it set for a few moments to let the bubbles settle,o i forgot drill a small hole in the bottle lid.now all you have to is flood the mold cavity with the mix.you will need to repeat this a few time the pop will absorb the mix the first time or 2.