I sprayed Krylon pepper red over a piece of the plain orange sprue, sprayed another piece that I had primed with the 2x grey primer. Could not tell the difference. I went ahead and did the body with the grey primer and put on the Krylon red pepper, it looks fine to me. The only problem I'm having, and this has been with the Rust-Oleum red and the Krylon red, is it stays tacky for a long time, does not seem to want to dry completely.