I've been doing a conversion where i add several layers of flowing cape to a model and have come across a problem. I made the capes from GS with more blue than yellow rolled as thin as i possibly could get it and distressed to look tattered, the only problem is ever after two days of drying its still only just holding its dramatically billowing shape. Would it be safe to add a thin layer of glue or varnish to give it some strength and hold or would that interfere when i get to painting it?