A carbamate film created when the amine curing agent reacts with carbon dioxide and moisture at the surface of a curing epoxy. It shows as a whitish haze or a tacky, greasy feel and must be removed by washing with water and abrading before recoating, or the next coat can peel off in sheets. Low temperature, high humidity and skipping the induction time make it worse.
Floor coat has amine blush all over it, scrub it down with water before the topcoat goes on.
Before recoating, try a water-break or pH test. If water beads on a cured epoxy or the surface reads alkaline, assume blush and wash it.
Also heard as
- blush
- blushing
- amine bloom
- bloom
Related terms
Sweat-in
Painter slang for the induction time a freshly mixed epoxy must stand before it is applied.
Dew point
Temperature at which moisture condenses from air; specs keep steel at least 3 C above it for blasting and painting.
Pot life
Working time after mixing a two-part coating before it has reacted too far to apply properly.