Quoted: i did some white Crayola on my Glock 34 slide a few years ago. i was shooting at the range in midday heat (it was June-July 2004) here in Phx, AZ and within 3-4 mags the crayon was running down the sides of my gun. (it was sitting in the shade when not being shot....of course the shade was probably 100+ degrees...) it is still lightly visible but i'm not going to touch it up or do it again on any of my guns.
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I think the Glock slide might be a different case though. I Know, cause I had a G17, and the slide gets very hot after a lot of rounds, or rapid firing. But for the fire and safe markings on the lower receiver, where it really doesn't get hot, and if it does get very hot in that area, your barrel and handguard would be smoking by then, and you'd stop shooting.
The only problem I've seen with crayola on my Bushmaster, is the red obsorbs the clp I use to clean off the surface, and eventually the red becomes so dark, it's hardly noticable (the red color), not really the case though for the white.
-mark