Powder Coating shops in LA area? (and other Qs)

[Kreukishot]

I went through the yellow pages...called well over 15 shops in the LA area...prices range from 80-250 dollars to powder coat some brake calipers. However, I was wondering if anyone had any experience with any good shops. Many of the shops I called don't go through the "iron-phosphate" process before the actual powder coat is applied but all shops told me they go through the sand-blasting. Is the Iron phosphate really needed to get a good bond between the metal and powder coat?

If anyone has any references to reputable shops (I don't neccesarily want to drive all over LA to look at some samples of work they did) or an answer to the iron phosphate question that'd be great.

Thanks a lot,
Chris