Thanks for your replies! I only have expereince using quite basic cheap household foil, not specialist craft foils. I've tried working with undiluted pva glue as well as clear "UHU" type glue, and in both cases the foil tended to peel off very easily, hence my post. I haven't yet worked with a glue gun , so thanks for mentioning that ! I want to be able to overlap and overlay the foil on a papier-mache surface. Perhaps if the mask is lacquered or acrylic varnish brushed or sprayed on at the end, that solves the problem, but it's frustrating when it peels as I am working on the object (which is quite curved and contoured , not flat, by the way). Thanks again for the responses.