Because the resin we are using dissolves foam, we had to coat our molds with a protective seal coined “green goop”. But before the “goop” was slathered on, we spent about a hour going over the three molds with power sanders. Next we further conditioned the molds by hand with fine grit sand paper. Once we were satisfied with the surface of the foam, we mixed up a batch of the sealant and poured it on the foam. It was a messy and stinky (chemicals) process but we were happy with the outcome. The next step is to add Bondo to the mold to fix any holes we made using the sanders.
