Thanks. I've been making a lot of stuff since l bought a little Lincoln flux core wire welder. I've been using Rustoleum primer, then paint, which works great to keep things from rusting. I just wonder how much coverage I could get up in the frame by spraying from the end. I have a can of something called Aerogrease which I can try. It's supposed to have the solvent evaporate, leaving a layer of grease behind. I just wondered what else folks have done. I may try the primer, then the Aerogrease. I thought about using that Great Stuff expanding foam, but if it doesn't work right, it would be impossible to fix.