I’m customizing a Humvee. I took the roof off so that I can paint it separate from the rest of the truck. It needed new gaskets all around. The roof has 3 pieces to it. The turret hole cover and two pieces that are welded together, making one solid piece. Where the welded pieces are, there is surface rust. Some of the areas are very hard to get at. One in particular, which I’ve included photos of, I have no idea that to do with. I can’t get anything in that area to sand it down. I have read on here the horror stories about rust converter spray. Any suggestions,