Powder coating can trap moisture and then lift in chunks, if there's a breach.
I'm trying Dulux epoxy metal care paint on the Vortex.
Just had it colour matched to the original olive brown as best as possible by taking the mower base in. Out turned out a tiny bit lighter than the original but they seem to have done a good job coming close and the paint man said it will darken a bit as it cures.

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!