Puttying over brass-coated steel?
I'm at a bit of a loss as to what I've done wrong, so if anyone with metal and/or plastics experience could help me out, I'd be very grateful!
Let me explain... I've cast a bunch of flat, thin pieces out of medium-set polyurethane, and before the plastic cured, I placed some brass-coated paper fasteners (or split pins) into the mixture - so that the pieces can be easily attached to my costume.
The plastic set fine, but the moment I started painting it, the plastic bubbled up where the fasteners were. I removed the plastic from on top of the fasteners, and tried layering on some Magic Sculpt to smooth the surface out... I thought that it would be heavy enough to counter anything the metal might do under it, but it bubbled up, too! O_O;;
I've since tried automotive putty, glue, acrylic paint, and enamel paint, and the fasteners just keep rejecting anything that is put on top of them.
I've cleaned the fasteners with acetone and turpentine, and I've sanded them so they have a rough surface for something - anything - to grip, but I'm having no luck at all.
The weird part is, I've cast fasteners into other pieces before with no problems, so I'm not sure why these ones aren't working.
Is there anything I can coat these fasteners with to get some sort of putty to stick to them, and smooth these plastic pieces out? Thanks so much for your help~!
Last edited by Melanie : 01-09-2010 at 10:11 AM.