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Old 05-16-2008, 09:25 PM
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Metal prep prior to epoxy

I'm new here and have been doing research into using epoxy primer (PPG DP50LF) on my latest project. I'm due to get the car back from the paint stripper (chem dip) next week, so I'll be starting from bare metal. Being that it's nice and dry here in So Cal getting the stripped metal covered right away isn't exactly critical but not too sure what I should start off with. The latest DP-series spec sheet says "Sand the bare metal areas completely with 80180 grit abrasive", now is it absolutely necessary to really gouge up the fresh metal with 80-180 for everything to go right or would something less abrasive do the job? The spec sheet goes on and seems to imply a metal prep stage is optional by stating "Chemical treatment or the use of a conversion coating will enhance the adhesion and performance properties of the finished system.". I've heard several opinions regarding zinc phosphate metal prep, my main concern is how it would react will the small amounts of factory lead filler that'll remain on the car (possible future chemical leaching from the lead); would it be best to avoid the metal prep in this case? Will acceptable adhesion suffer if I go without the zinc phosphate stage?

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Old 05-17-2008, 03:46 AM
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From the sanding to the metal prep suggested on the tech sheet it is very important that you adhere to that companies recommendations for the prepping of surface.

This is the most important step you will do on the car and that company should know how, where and why certain prep should be done to make the product work best for you.

Common marketing sense will tell you if they wanted , Zinc Phosphate used it would be very easy for them to package in a quart can and sell it as an add-on for $100.

Sanding of metal? Yes and and they ask for 180 or 80, I would use 80 and yes, it must be done.
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