Spray Paint Hazing: Stymied by the Weather

Having recently completed a cosmetic restoration of the engine compartment of my Packard less than a year ago, you’d think I would remember not to paint parts in cool weather, but did the fact that the temperature was 65˚F trigger a pause?  Nope!

On Thursday I had a free moment at the end of the day, so just as it was getting dark (read: cooling down), I put the first coat of semi-gloss black paint on the Packard gas tank.  It looked great…for five minutes.  And then as the paint dried, the all-too-familiar white fog/haze started to appear on the surface of the paint, making it look like an amateur paint job.  And then I remembered: painting when it’s cooler than about 68˚F or when the humidity is higher than about 60% can cause spray paint hazing as the solvents evaporate from the paint as it dries.  Basically dew forms on the surface as it dries because the evaporating solvents lower the temperature of the metal to below the dew point.  Ugh!  This happened to me repeatedly as I painted the Packard engine components and was a consistent source of frustration…stymied again!

While waiting for warmer weather and free time that coincides with aforementioned warmer weather, I blew out the fuel lines (sprayed some brake cleaner into the lines and then used the air hose to blow air backwards through the lines), checked the fuel pump sediment bowl for gunk, and disconnected the pump-to-carburetor line.  It was kinda disappointing, I didn’t find a single grain of sediment or yucky-ness.  So, now it’s onto the carburetor rebuild!  Wish me luck…

Hopefully this will serve as a reminder not to paint in cool weather once I get back to work on the Disgustang!

IMG_3413 spray paint hazing on gas tank spray paint hazing on gas tank gas tank spray paint hazing