I've been fascinated by how gold or silver (and bronze too) powder mix looks on people and have been wanting to try them for so long!

Thanks to some help from a WAMmer I know, I found some local store that sells Mehron powders but at 15 dollars, they seemed quite pricey. So I found a local made alternative which is made for arts an crafts purposes. Would it be safe to use?
Another question is, after I've had some fun time looking nice and shiny, how hard would the clean up be? I've heard that it can get quite a bit tough, but I was rather curious on how long it would take (ie. less than an hour or over 2 hours etc) so I could better plan my time with it, since I really do not want to get caught by my family.

Any help would be wonderful!