Looks cool, I've never seen that before. I've used a different product you spray on bare metal after welding so you can let your piece sit for a long time until you get it finished or finally painted. It goes on clear as well, might be a similar idea. I think the stuff I used is ZIM or SEM or something like that. I just borrow it from the welders on occasion. Our climate is pretty dry so corrosion is not really an issue. Well maybe in a trailer plug, they always seem to end up on the ground.