Since the paint always requires 2 coats (imho), I prime and first coat trim before installing it. Putty the nail holes then do the finish coat.
As for back priming, I've removed tons of old trim that was not back primed and was in perfectly good condition. I think back priming is a must for anything exterior or in bathrooms cuz of humidity, but I generally don't back prime interior trim.
Also, prepriming and first coating requires room to rest the pieces while drying. If I don't have the room I just prime and paint after installation.
Just my nickel's worth.
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Last edited by ToolGuy; 12-02-2007 at 11:27 AM.