re spray.bike paint - I've done 3 frames with it. My first still looks the same as almost 2 years ago. I'm guessing it has 1000mi on it since painting and been ridden in rain/wet grit pavement.
The second is in good condition still and owned by a teen(so not easy on it) who rides the bike to school.
The third is a kids mtb frame that my youngest uses. It's been 4 months since paint and she has rubbed/scratched the top tube a bunch due to swinging her leg over. It's a bit big for her still, so that's partly why.
The rest of the frame's paint is great and has held up as expected to all the brush/sand/dirt on river bottom single track trails.
Prep is most important. 85% prep 15% paint.
It wont look like a professional wet paint, but it is durable and looks as good as I care for it to look.