Do You Need Multiple Layers of Gamvar?

Just a single coat of Gamvar is going to give you adequate protection for the many many years it's on display. The beeswax matting agent that is in those which make them less glossy as they dry when one starts putting layer after layer of the satin and mat often people end up with a patchy or cloudy look because they're building up a concentration of those matting agents. gloss Gamvar does not have any matting agents so the gloss Gamvar can have multiple thin coats meaning more sparkly shiny look as it dries. If your painting was dry enough to be varnished with gamvar it's safe to be removed off using gam saw.