I'm wondering how well these rust products compare to each other, through reading through many posts here it looks like there are a few that you guys like; por-15, eastwood, rust bullet, rust mort, zero rust, OSPHO(spellcheck), the only areas on my 78 that seem to have developed rust are the trunk latch area, the bottom of the door, and one frame rail. My only concern is i do not want to end up putting money down on a decent paint job to see it rust through in a year or two.