Pre tank venders that have grey film? should I ruff sand, or

Re: Pre tank venders that have grey film? should I ruff sand, or

Yes the tank is sealed. Yes it I believe that coating is phospate but my hands have been all over it in mock up, I had to tig a few holes shut on the fender. Did some cutting, and shaping. So I think the etch has be compermised.

The tank sealer won't live long with p/c cure temps. Pick your powder color for your fenders and then call your painter for the tank.

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Re: Pre tank venders that have grey film? should I ruff sand, or

If they were like my fender they are phospate etched...

Yikes, you've got a lot of steps in there! No need for all that with sheet metal. The outgassing dance is for cast parts only. With that being said, I'd do the following:

Media blast with 60 or 70 grit Alum. Oxide.
Blow with compressed air.
Sand with 220 w/d paper (doing it dry is fine)
Blow again.
Final clean with Acetone or MEK or Denatured Alchohol.
Quick pass with the torch.
Shoot the powder.
Cure.

A lot of this also depends on what powder/color are you planning to use?