Uh oh the Ospho word.
OK here we go- I sandblasted some front grille parts for the 1959 chevy truck I am starting. Brought them home and evenly sponged ospho on them. I then took one of the parts and rinsed it with water and dried it. Flash rust occured right away so I reapplied ospho.
Is this the correct way to use OSPHO i.e. put it on and leave on without rinsing? the directions on the container do not say anything about rinsing but they have a mild warning about testing use with epoxy products.
On the other hand the PPG DX520 cleaner which is a phosphoric acid states to rinse the item and prime the same day.
Is the SPI primer compatible with subsequent PPG colors?