Does powder coat harden over time after curing?
No. Unlike wet paints, where the polymerisation process continues for a while, a powder coat finish melts fine beads of pigment together in the oven. Once it's cooled down, that's as good as it's going to get.
Not quite, many powder coats use polymerization (epoxy or polyester resins) but I believe most of that happens at oven temperature.
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No. Unlike wet paints, where the polymerisation process continues for a while, a powder coat finish melts fine beads of pigment together in the oven. Once it's cooled down, that's as good as it's going to get.