Hi, I've only ever done small decoupage projects, like a photo frame, little box etc, where I used PVA glue on a sanded wooden surface.
I really want to decoupage my son's old pine desk with comic strips, and I need some advice. Is it possible to have something more hardwearing than PVA that won't discolour over time (such as varnish)?
I'd go for a spray varnish like Winsor & Newton Craft Varnish. Use PVA to stick the comic strips and after it's dry spray a couple of layers on top...OR Plaka spray varnish is really shiny if you fancy that?! I think most hardware stores stock it.