painting aluminum t-top

[Destroyer]

Originally Posted by Kracker Jack

Lets say I used a Moeller or Tempo green zinc cromate, Is my epoxy finish coat compatible? Whats the the best zinc cromate to use? Airplane Plane Spruce has some decent zinc cromates.

Long and the short of it.... Yes, you can paint epoxy paint over a pure Zinc Cromate primer. If you want the best, check out the inorganic zinc or zinc chromate type coatings such as Dimetcoat from Ameron/PPG. These behave like galvanizing so if the coating is ever chipped, the surrounding paint will protect the bare area. Just remember the zinc paints don't hold a top coat as well as the epoxies so there is an increased chance of the topcoat flaking. However, you can also purchase epoxy based zinc cromate primers (Sherman-Williams GBP) that hold the topcoat very nicely. Then just finish with the epoxy topcoat of your choice.