So yeah, first post and all, I'd like to start of by saying this website is awsome, while searching high and low for acceptable information for building a costume, this is by far the most informative and useful resource.
Anyways, to the point: I'm using the Sintra material to build my own Halloween costume, but am having trouble with painting it. To achieve the color I am looking for, I have to paint with Silver first, then top with a Transparent Red to get a metallic red sort of look (looks great BTW). The problem I am having, is that the paint is very easily scratched off. Mind you, I have only used a test piece, and I only gave paint coats about an hour to dry before applying the next coat (I think this was fine, as most say they dry in 15mins or so, but do say 24hours "to handle"). The progression of layers was to start with a White Primer spray (not sure if a good idea or bad), then a Krylon Silver Metallic spray, followed with 2 layers of Testors Transparent Red, and lastly with Krylon Gloss Coat. All painting layers got 2 coats (or 2 pass-by's) while painting, except the red got an extra set of coats after the first dried (as 1 set of coats is too light).
So I have my test piece, and I can pretty easily scratch the paint off with my finger . I had hoped the top coats of Clear Coat would protect it from that, but to no avail. Any recommendations how I can paint this stuff to where it won't easily scratch off?
Lastly, while I am a Star Wars fan, I'm not actually building anything Star Wars related (please don't stone me!). The attempt here is to pull off a custom made Iron Man armor (custom I say, because matching the exact look of the new movie armor would take me years, and this is the first time I have worked with Sintra). I will post some progress pics as I get to them. Thanks in advance!