Well, I can not top all the Information you guys have with the SR-71's paint, but I might have something close...
Sport Compact Car had an article with some Dyno Plots and showing a few different scenarios of; What effect Spray Painting the Intercooler might have in a real world situation. As some stuff SHOULD work in theory, it sometimes doesn’t turn out that way. I will try to dig up the magazine, but if someone else read this, please chime in.