I was wondering what everyone's advice is for painting areas you cant reach once they have been welded to stop rust. I've seen a lot of people on youtube and such using lots of weld through primer, but I've seen discussion on here that it's not much use for stopping rust? I'm using Jotun 90 epoxy primer for everything I can reach, so is it worth trying to spray some onto it with a shutz gun, or am I just overthinking this and should just use a good cavity wax? I have the same question for plug weld areas like sills and such too. Here is an example of a patch i'm making for my chassis that has a section that's covered once I weld it in place. Thanks for any help.