When using pre-primed interior molding, ie base, crown, etc, do you guys scuff sand and re-prime the molding after it arrives on site, or just a quick scuff and on to the finish coat of paint?
MDF, primed poplar, finger jointed , etc….
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Reprime. Some primers only have tooth for so long, and you dont know how long it was there. Everything gets sanded anyway, and anything you sand you take primer off of, and anything that had to get made along with it, any pieces that came from another source, there's always stuff that has to get primed. Shoot the whole deal.
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You say THE finish coat of paint like you only do one coat over the primer.
We do two.
The preprimed gets filler, caulk, and some sanding, then on to finish
Exterior does get another primer after it is up.
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It sure can't hurt to prime it again and there have been a few occasions when I've done that, like when I have to sand it back to bare wood or there are a lot of stains, but I don't usually bother. I think today's acrylic paints do a pretty good job of adhering to "old" primer. I do wash it down to remove any dust/dirt that might have accumulated while it sat around.
I use 2 coats of paint on new molding. 1 coat of paint before it gets installed and another coat afterwards.
Thanks for the advice! I wasn't certain if I should re-prime, but the intent was to paint once on the saw horses, then again after it's installed.
Clean it, scuff it, paint with at least two coats.
Edit: Assuming interior use only. I don't use/recommend preprimed trim exterior, as it is fingerjointed (or MDF) and the joints will telegraph (and possibly fail) over time. For exterior, use Azek, make your own out of cedar, or use stock pine trim, priming all sides/edges/ends (true for any wood product for exterior use.) I've never tried Miratec, so I can't give any opinion on it.
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Edited 12/30/2007 8:59 am ET by NickNukeEm