My Bassa came with a rusted through front fender. I took it to 2 auto body people and estimates for prep and pant varied between $1k and $2k! Others have written about SprayMax paint here. It's genuine, 2k epoxy automotive paint with a separate catalyst that comes in a spray can. In my case the primer and clear coat were 2k (catalyst) and the base color and metal flake were 1k (no catalyst). My buddy Neil at my NAPA store custom mixed the base coat color for me. In the end, it's a pretty darn good match. Not perfect, but pretty good.
Long ago, I painted my Suzuki VX800 with single stage paint using a HVLP spray gun in a makeshift booth:
http://nwguy.fun/mc/paint/index.htmlIt came out great, but this time I didn't want to build another booth. After the normal laborious prepping of parts I set up an area in my driveway and waited for a calm, warm morning with few or no bugs, cottonwood seeds floating around, and other stuff. I bought 2 cans each of the base color and clear coat, and 1 each of the primer and metal flake. In a way, multi-coat paint is more forgiving than single stage paint. You can sand and fix mistakes and resume spraying coats.
Spraying was mostly uneventful except for a bad nozzle on the primer. Neil at NAPA gave me a new can of primer at no cost. After curing and drying for a few days I wet sanded with 1,200, then 1,500, then 2,000 grit paper. Then buffed with 2 grades of paste. Then waxed. It's a tough, durable finish unlike regular rattle can stuff you buy at the hardware store. I'd do this again without hesitation.
Primer, metal flake and clear coat

The rusted front fender

Universal hard bags prepped for painting.

My buddy Neil at NAPA and the (expensive) paint can filler.

Painting in my driveway.
Compare repainted rear fender with original tail light housing.

Compare rear fender with original side panel.
Replacement front fender painted.

Rear fender painted.