Questions to ask @ the paint shop?

I would ask if he can give any references. First I would search online to see if there is any info out there, good or bad. Just google the business first and go from there. If there are any bad reviews ask him about them and use your gut to tell you if he is on the up and up. If he gets really defensive I would be concerned. If he explains the situation and you feel it is legit I would be OK especially if he gives you references that check out.