I've DIY painted parts and they have come out looking just like if you took it to a shop; However it takes a lotttttt of time(prep work) for that.
For bumpers make sure you use a proper bumper adhesion promoter and primer (so that it wont crack/blister at the slightest stone chip.
And also if you think you've sanded smooth enough; keep going because there's likely a few things you missed. Also do an extra few clear coats(not too heavy though) so you can wetsand and buff it all out
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