• 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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