Post welding protective painting
So was just sitting here and thought I'd ask a question to the fabrication crowd. Hopefully it's not a well covered topic, sorry if it is. Probably over thinking this, but hey why not ask.
Wondering about welding a reinforcement plate to existing flanges or mounts. Say a guy was going to put a plate onto an existing part to stiffen a mount. I know to remove the paint where the weld is going to lay. I'm wondering about if you totally clean both parts and there is no paint on the existing flange then you weld the new plate on top of it. For some reason you can't weld all around the new plate, so there are gaps for water or muck to get in between the two. Wondering if there are any solutions or solvents that can be poured into the seams that might wick into the gaps to create a rust barrier between the two plates. All I know is to apply several coats of rattle can paint, wondering if there is another tactic. Course, I know this is up there with worrying about the sky falling, but thought it would be fun to ask.