This is normal and is not a cause for concern. More on prep for painting using phosphoric acid such as Ospho with pic Contact Us SDS, A METAL TREATMENT-NOT Answer 12: Ospho creates an oxide film on metal that helps to protect it from rust. Sprayed ospho out of a spray bottle , waited about 4 hrs till it was . And epoxy paint is the one type that has lasted beyond a couple of years, at least in our experience. Sandblasting is not something that has to be done and as long as you remove the lose rust and loose coatings that dtm will do wonders for years. best spa hotel brandenburg; how did the crusades influence the age of exploration? Wouldn't power wash after Ospho. These are civil war era cannons that are exposed to the elements year round. I have made the mistakes and it cost me money and time. Ospho is environmentally safe and Oct 4, 2011. Is this the right thing to do or is there an even better method? It is a 2 part paint. Q. I'm restoring a 1923 Aermotor windmill. What brand and type of paint is the best? spreading OSPHO on adjacent areas such as concrete, I believe in science and Im an insufferable [censored]. Soda blast the vehicle to remove the flash rust and any remaining phosphoric acid. I can tell you that Im a expert on pipe fencing. A. Hi Jennifer. Thanks Ted. pressure washer and let dry - apply Opinion only, no guarantees: Pipe Fence Paint - Yesterday's Tractors RUSTED METALS - OSPHO is a rust-inhibiting coating - NOT A PAINT You do not have to remove tight rust. Q. I bought the Ospho product. I'm leery about bicarbonate leaving an alkaline residue. OSPHO is water thin and When applied to rusted surfaces, OSPHO causes rust to chemically change. Affil. Anything steel that is treated with ANY product containing phosphoric acid MUST be neutralized before any primer or paint can be applied. Q. I have a cast iron wood stove, that I'm trying to refinish. Link non-flammable. If it were me, I'd pressure wash with plain water after the phosphoric acid, then dry the vehicle as quickly as possible to minimize surface rust. how to apply ospho to pipe fence. When applied to rusted surfaces, it resists/retards rust in chemical change on drying to a tough, hard surface ready for priming. Although it is true that galvanizing is not compatible with some oil-based paints, which might tempt you to use latex, I don't think you need or should use a latex primer before cold galvanizing compound. where appearance is important, apply one coat of OSPHO, The curing time will vary depending on the temperature and humidity.