Question for Trayder or anyone else

[MKG]

I found some rot around the inspection hatch for the sending unit of the fuel tank - I am replacing the deck next year (raised etc) but have taken out the rotten section already to prepare for this season. When removing the upper skin, it cracked and in fact cannot be reused to to the bad shape of the area around the inpection hatch. I am going to repaint the deck anyway thus do not need Gel coat. The question I have is when using the molding table, if one does not use Gel coat and simply uses Epoxy - does the mold release wax still work? I am going to rebuild the upper skin with core then cut the new hatch and replace the area I removed - then fair the area and repaint to match the rest of the deck with the existing non skid etc. I just dont want to go the route of mold release wax only to find out it wont work !

Many thanks in advance

MKG