There is a long thread on here that is intense on Ospho pros/cons. I wrote a brief reply. If you use Ospho like I recommend it is a process to do it right that hardly anyone does. First wire wheel, scrape and get as much rust off as possible. Pressure wash or dust and wipe off and wipe down with water based surface cleaner/degreaser (not lacquer thinner). Paint with ospho. Wait 24 hours or more. Dust off any powder. PAINT WITH OSPHO AGAIN and leave on about 5 minutes or so keeping it wet. Rinse well with pressure washer and/or a scrubby pad and lots of water. Let dryThanks guys. I'm going to try and do some reading on both and then decide. I've found the Ospho locally where I won't have to order it so either way shouldn't be a problem. Thanks again.