I have vacuum pressed skis before. Working on a new project now, going to be essentially pressing a longboard. Top sheet, fiberglass, birch/poplar core, fiberglass, top sheet would be the layers going top to bottom (lower topsheet just for keeping out moisture/help avoid scratches/delam on the fiberglass).
For skis, I cover my mold in tyvek, do the layup on top of this (base, vdf, fiberglass, core, fiberglass, topsheet), then put the entire press into a vacuum bag, tape the ends, and then I'm good. Usually just scrape/belt sand/give it an initial tune to clean up he bottom.
Here I can't do that, or I would damage the thin bottom layer. Also, we are pressing flat, which may make the process simpler. I can't seem to find to much info, but my main issue is what to use to soak up extra epoxy and ensure a clean bottom surface. I have seen breather material and release film, but I don't understand the proper way to use it 100% for this application. Anybody have any tips?