For insurance/collision work.....I go to Jack's Paint Place -
http://www.jackspaintplace.com/
Converse, TX
They've always done a good job for me, family members, etc. at least a half dozen times or more in the last 15 years. Color matching and quality of paint work has been excellent. Workmanship as far as putting things back together and aligning panels...it's gonna depend on the technician. They've always been able to make me a happy customer when I've notice a glitch I wasn't happy with. YMMV. It is a clean and well organized shop and they keep their word, deal with the insurance company for you and stand behind their work. They'd likely be a bit expensive painting your spoiler but, I'd trust them 100% to do it right as far as color matching.
My neighbor recently had a car painted at Southwest Paint and Body on Nacogdoches Rd. (I was the taxi driver for my neighbor.) The owner, Jeff Collins, seems like a friendly guy. He is a talker, wheeler dealer and a BSer. He admired my BRZ and commented on the SWP pearl finish. They'd likely give you a better deal than a place like Jack's. SW charged $900 to paint my neighbor's car and that was a pretty good deal for the amount of prep work they did. If I had a spoiler to get painted, I'd check them out and at least get a bid - opinion, etc. They did not have neighbor's car ready when they said it would be ready the day before so we wasted a trip to go and pick it up one evening. FYI. The shop is on a hill and the parking lot is pretty crowded. Use caution if you pay them a visit. Looks like they do a pretty good volume of business. They stay open late in the evenings. Note: They only accept cash for payment. Hmmmm.
One of the things you need to be careful with is the color/finish/paint matching technology of the shop you take it to. If you want it to be perfect, you need to let them know what your expect at the outset. Pearl finish is a bit tricky to get perfect. Also, car paint ain't cheap. The body shop will likely have to buy a quantity of paint in excess of what it will take to paint a spoiler. If you can find a shop that already has some leftover whiteout paint in stock you could get a better deal as they wouldn't have to buy any and may be able to pass that savings on to you. I am assuming you'd want the spoiler to match your car color! If anyone on here has had bodywork/painting done on a whiteout or SWP lately, chime in and tell @
FrsRN where you took it!
There are lots of body shops out there so, shop around and deal with one that you'd trust and feel comfortable with. Hope this helps.