You do not need Vorgelat. thecost and hassle of getting EU materials
in the USA are prohibitive IMO. Poly-Lux, Prestec, Ferro are all
U.S.A. polyester paints ("glecoat") that will work fine for your
needs. I would check with boat repair places if you are near water.
they would also have "gelcoat". Shipping such materials and
especially the catalyst (MEKP) is getting very expensive due to hazmat
fees.