Sorry if this isn't in the right place. I couldn't find a trailer repair section. I was supposed to get my boat sand blasted by my cousin but he can't get his blasting setup to work. It has been a month already and I don't want to wait any longer. I decided to sand it myself using wire wheels and a rust converter called ospho. I pulled apart the trailer so I can work on it in peices. I am now working on the long beam that has the towing tongue on it. I can look down the center and see there is rusting on the inside. Not to bad. Pretty much the same as the outside. Seeing as I can't sand the inside does anyone know if I can just pour the ospho in there and leave it after it cures without painting it? Or should I just not worry about the inside of the beam?