I gave it as much time as I could to let the paint cure as much as possible, gave the hardware a thorough cleaning in some mineral spirits in my ultrasonic (it's all so beat up that while the grease and dirt cleaned away, they don't look all pretty shiny new, save for the new yellow zinc bolts I installed it all with). Overall I'm very happy with how it turned out. It's FAR from a show finish, but the metal is all repaired and well protected for many years to come, and the appearance is still that of a good utility paint job. This is one that I'll be able to easily mix and use new batches of to repair any damage at home, or even completely paint any replacement body panels or doors that may have to be used in the event of trail or collision damage.
One thing that happened while stripping the hardware away was the plastic grommet in this hole from the factory was destroyed during removal, so I found a black vinyl grommet at the local Ace with a perfect ID radius for the lock pull. The OD was 7/16" so I had to slightly enlarge the hole in the tailgate and deburr it before priming and painting.
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Nice new pretty yellow zinc bolts holding everything on, and I bought a roll of edge trim at O'Reilley to go along the top edge since all the paint had been almost completely rubbed away from the metal over time. I think the plain black actually looks really nice on OD green too.
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And back on the truck! I love how it looks and now can't wait to get to work on the rest of repairs and paint. This has been a hell of a learning experience and I'm glad I attempted it on my own because the lessons and experience I gained will only help me in the future.
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Forgot to add, all in all I think I spent (including the price of the dent puller kit which I wouldn't have needed if I had thought to use the pry bar trick that
@kelly saad described when I welded the patch edge closest to the end of the tailgate) just shy of $300.