As title says; I have used alot of their product and so far (except for the "factory manifold gray" that I put on my daily driver pick-em-up's headers), I have had great "luck" with it. I have never used their "metal ready" but about 90% of the time I've used it on, has been freshly sandblasted metal with a rough texture and some "tooth" for it to hold onto. Abt 6 mo ago I decided to buy a gallon (costs as much as only 3 qts) since I have more than 1 project going that I could use it for; one I was not planning on,was my too-new-to-talk-about here, replacement frame for my 97 Wrangler. (yeah; 12 years old and ready to snap just ahead of the driver rear axle arch) but on one of my frequented mopar oriented threads it seems the "POR 15 bashers" are coming out of the woodwork. So I thought I'd see here what you guys think of the stuff; where you have used it, (what types of parts, let's keep this outta the toilet) (1) did it work as you had hoped? (2) is it holding up? (3) surface prep (if you did any) (4) would you use it again? (4a) if NO, what have you found as a better alternative? and (5) any other comments that I have not thought of. When I bought that gallon, I had considered Rust bullet but at that time I got "6 of 1, 1/2 dozen of the other" type replies as if they are both about equivalent (color aside; I mean as far as stopping/preventing rust, and the coating basically "holding up") what made up my mind was that POR is available <10 miles away any time I need it vs R-B needing to be ordered and shipped from outta state. But as I said now the bashers are out. So being as that I'm about to need some more, either POR (Or should I try the R-B this time) I just wanna know what you guys think. I also have one of POR's Chrysler Blue "engine paint kits" here to use on my 318, if I can get caught up enough to get back to THAT project! (still on the stand fresh from the machine shop bare block, rusting away) story for another day.