How do you paint over Ospho?

If the metal is a galvanized trailer, just wire brush off the Ospho residue and hit it with Cold Galvanize spray paint as your primer. If standard metal, you must neutralize the Ospho with Baking Soda or ammonia. Spray all the areas with the neutralizer, wait 15 minutes, wash down with clean water then blow dry.Click to see full answer. Correspondingly, how do you neutralize Ospho?To neutralize the Ospho MUST be wet, so if dry, re-wet with itself and let set one or two minutes and with a clean rag and water, wipe off like washing the car and then dry. Next, then da car with 80 grit, clean with 700-1 wax and grease remover, let set an hour and coat with an epoxy. can I use por 15 over Ospho? POR-15 is good stuff, but it need a tooth to bite, in fact, it does better on rusty metal than is does on sanded/wire brushed smooth bare metal. I would use the POR metal etch over the OSPHO. I would either use the POR 15 metal etch, or just POR-15 straight on the rust (knock off the big stuff). Keeping this in consideration, how do you use Ospho on painted surfaces? Merely remove loose paint and rust scale, dirt, oil, grease and other accumulations with a wire brush or pressure washer and let dry – apply a thin coat of OSPHO as it comes pre-diluted in the container. Let dry overnight for a minimum of 24 hours, then apply whatever paint.Is Ospho any good?It’s a great product and have used it successfully for years. OSPHO is a brand of phosphoric acid manufactured by The Skybryte Company. It converts rust into a zinc phosphate which makes a great pre-primer. It will look powdery white/grey when completely dry.

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