I did two layers of #476s (paste version of #845), not because it's necessary but to make sure I covered everything & didn't miss anything.
No paint damage will occur and a Collinite CS rep said that additional layers can be applied after waiting 1 hr (search for a thread called "Collinite #476 review" to read what Collinite CS said).
Many people have said that protection & durability of Collinite is great but the "look" leaves much to be desired but I disagree. I did 1/2 the truck lid with #476s & 1/2 with s100 and I don't see or feel any difference.