You’re welcome to post the ones that you know. Here are some in and around Southern California.
Cerritos College - This one probably has the most extensive training program when it comes to composites and plastics in general.
OCROP - Fiberglass and Plastics taught by J. McNear. I am actually attending this class twice a week just to gain any additional knowledge that I can. James is a great instructor with over 20 years of experience. He also builds his own race cars and is an avid weekend racer. This course is provided by Orange County ROP program and is open to all adults as well.