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Old 11-08-2010, 08:01 AM
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primered fenders

How good is the black primer on new fenders, should I sand and primer or not?

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Old 11-08-2010, 10:04 AM
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It definately needs to be sanded if you are shooting for a thourough and quality job. To many replacement panels have runs and paint flaws that you don't want showing up after you have painted it. And almost every one I've worked on needed some straightening by block and hammer or skim putty. Just a warning, these reprodution facilities tend to make parts in batches and I have found several that had light surface rust under thier primer from when the steel sat either prior to forming or prior to priming. I found this by prep sanding it with some 200 grit, next thing you know the black primer is popping off in places with rust underneath.

Sand it and keep your eye open for bubbles and runs.
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Old 11-08-2010, 10:11 AM
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I would agree, always re-sand and primer new parts. not only will you see if there is any surface rust but with a new coat of primer you will see any surface damage.
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Old 11-08-2010, 07:17 PM
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We just repalaced a rear quarter panel on a 2010 ford and the new panel had runs in the e coat and pock marks best to always sand and primer.This was a $1200 panel .Yekes!
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Old 11-08-2010, 07:32 PM
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these aftermarket panels will almost always require some bodywork. They are so thin that they get damaged during shipping. You'll be getting a panel with a little ding here and there. You can run 80 grit sandpaper on D/A sander and then use primer surfacer. No need to strip it all the way down.
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