Re: What is the best metal primer ?
Im a firm believer in PPG's DPLF series. I have tried Duponts Veraprime self etching primer and had it peel off the metal. Im sure I did something wrong application wise but I have never had any issue with PPG DP and it is very very tough. Its somewhat expensive so maybe the Sikkens mentioned above would be a cheaper alternative but overall I would say use an epoxy primer.
As far as prep, grit blast is best but your 80-240 DA will be OK, then use the PPG metal treatment and conditioner if you want to go the extra mile. The first bottle is purple and will remove most surface rust. The second bottle which is yellow will eat some rust and leave a phosphorous residue which I understand is good for paint adhesion. BTW, after you rinse the purple off you will not be able to avoid a serious surface rust residue. To avoid that I spray the yellow on after the purple sits awhile, rinse and then repeat the yellow. You will still get some light surface rust residue but I dont think its anything to worry about, it will not grow and pop the paint off like some internet jockeys will have you to believe. Also after using these treatments you are assure there are no silicones or other contaminates waiting to ruin your work.
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Last edited by badbascom; 11-03-2010 at 08:55 PM.