Quote:
Originally Posted by nytrainer
If you “pickled” the bare metal with Ospho then what you need to do to neutralize it is to reactivate it by scrubbing with Ospho solution then rinse well.
Then it’s important to hit the bare metal panel(s) with 80 grit sandpaper (or equivalent media blasting) before spraying epoxy primer. You can do this process a panel at a time if need be. Choice is yours but any body filler needed can be applied either under or over SPI epoxy. Follow the 7 day window requirements on any subsequent coats whether they be filler, primer surfacer or base.
I wouldn’t trust using expensive top coats over anything but proven substrates.
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Dave, what do you think about re-spraying it with Ospho (that's how I originally applied it) scrub it with a big bristle brush and then high pressure wash it? Figure a high pressure washer will get less water in the car compared to using a hose.
Since it's just the underside of the roof that was bare metal from the factory I'm tempted to just shoot it with some red oxide primer.