Ummm, none is probably preferable.
Water always gets past sealant and gets trapped and rots it out.
Something like POR 15 is good if you already are covering up rust, otherwise a clear drainage path over paint is the best in my mind.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT'sKEN wrote: