I'm finishing up the blocking on the body shell of my 79 in gray 2K. I decided to paint it GM Artic White, and had a question about the sealer. I plan on shooting a coat of sealer (over reduced SPI epoxy) but I'm concerned that if use white sealer, it will make it difficult to see my coverage as I shoot the BC (my first paint job). Would you recommend adding a very small amount of gray epoxy to tint it, making it JUST a shade darker for contrast, but yet not severely affect the brightness of the BC? If so, how much tint?