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Nozza said..
The spray can paint never seemed to properly harden, and didn't stick very well even though
Standard spray cans work very well, if you only apply very thin layers, each nearly transparent. You need to apply 5 or more layers.
If you try to get an opaque layer in a single pass, it won't dry well, and chip.
And you should protect the paint by a clear varnish afterwards. 2 to 3 thin layers.
I use a small piece of tape that I apply on the nozzle hole between layers, so that I do not have to use up gas purging the nozzle.
To fill in the chip holes/depressions, I often use solarez, much more practical than waiting for a normal resin to cure.