Despite being in very good shape for their age, the GMC grille from the swap meet and the grille support panel from Arizona were both still going to need work.
The first order of business was to unbolt everything from them and get to work grinding all the paint off. The grille panel has this odd spot of rust. Which, given its location, was probably the result of battery acid from a battery leaking or exploding, fortunately it was only surface deep and came right off.
A few hours work gave me a shiny and largely rust-free grille panel. There was no rot, but there will be a lot of little dents & dings to fix.
Then the grille was similarly ground clean. I found one old dent that will need a skim of filler to be smooth, but there were no nasty surprises hiding under the paint.
Both were given two coats of MasterSeries anti-rust paint.
One surprise I did run into was that despite having come with a GMC grille on it, the Grille panel from AZ was actually for a Chevy, which meant two of the mounting hole per side were in the wrong place.
Fortunately this turned out to be an easy fix, the brace on the back had a cutout where the GMC grille hole was supposed to be, so I just had to drill them out and I had the correct holes needed to let the GMC grille bolt up.
I painted the backs of both with Rustoleum, then sprayed the back of the grille panel with truck bed liner. I think it was because I didn’t dust the parts with primer when the MasterSeries was still wet, but when the bedliner went on it crinkled and lifted most of the Rustoleum off the back of the grille panel.
I power-washed it the next day and was left with the result at the right. I’m going to need to sand this down to get any other unattached paint off, then re-prime & paint this again. Not a huge setback, but very annoying.