[theastronaut]

I had stripped the doors awhile back by blasting the inner frame and DA sanding the outer skin, but there were rust specs that didn't sand off. I didn't want to blast these and warp the skin so I used Ospho to soak the spots, along with scrubbing with a scuff pad and a stainless brush on the worst spots. Most came off quickly but a few spots took awhile to clear up between scrubbing and soaking. I kept the Ospho wet and thoroughly rinsed the doors to neutralize the acid so there would be no issues with epoxy adhesion.







Starting to clear up.






99% clear, one spot was more stubborn. Blasting the door would've meant spending more time on this spot with the blaster, so the metal would've stretched more in this spot than anywhere else, leaving a high spot. Acid with epoxy isn't ideal but I felt better about doing it this way to prevent warping. This is another reason I don't trust "rust converters" or Por15 type products... even with abrading the surface to bare metal all over there were deep enough pits that a spray on rust converter wouldn't have been able to penetrate into fully to kill the rust at the base where it's most active.




I found a spot of rust through where a brace is spot welded to the frame, so I cut it out and blasted the inside the inner frame. There was a bit of flash rust from rinsing the Ospho off that needed to be blasted off the inner frame too.




After light blasting I welded in a patch, then brushed on two coats of epoxy to seal up the inner frame and bracing.