04-15-2014, 12:01 PM
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#12
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Senior Member
Join Date: Dec 2010
Location: FRESNO, CA
Posts: 12,560
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Re: bondo then primer or primer then bondo?
Quote:
Originally Posted by Purdy Swoft
Mike V is right on in post #3. I started doing bodywork professionally in 1965 and things have changed a lot since then. Back in the day we only applied body filler on top of clean ground metal. Any small spots that the grinder didn't get, we would use a drill with a broken bit to get every speck of paint out of any crevis. Fillers and methods have changed. Actually, water can penetrate right through most body fillers or paints and primers that don';t use a hardener. This is why it is best to prime the bare metal with a suitable primer before appling body filler.
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Purdy's "broken bit" trick works GOOD! It was also a MUST, to clean out dark pits, when applying LEAD.
Yesterday I saw a Mustang with Bondo peeling off & the paint under it was NOT EVEN SCUFFED with sandpaper!! When all else fails, READ THE DANG INSTRUCTIONS ON THE CAN!!!!!---Bill W.
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