Hey , does anyone know what product,is used for rust pits, once the metal is sanded to the point you can't get it all, that is cheap in price and sold in Canada. My car is a 48 Chrys and has 18 gauge sheet metal, but after sanding down panels, especially around drip rails, where surface rust pits were all sanded out, but some pits are still there.................Thanx and keep rolling