It’s my experience:

Took less than 3 minutes to sand old paint down on the rear bumper. Is it possible?
Didn’t clean the dust or anything on the bumper before painted it.
One spot likes water drop.
Dust everywhere on the bumper after painted it.
It's easy to find the repaired part on the bumper because the bumper is not smooth and flat.
Never call you back after received your money.
Consider more before you call or email him.

His information:
[email protected]
626-234-9016