BlyGold is based in Florida, and can be reached at 888-924-4060. Explain your situation, ask their advice based on the weather where you live.
However, their products may be only used for larger commercial systems.
Perhaps they can give you the name of a local technician who uses their coatings on residential systems.
Don't try this yourself, of course. And remember, anything you do may invalidate any current warranty on the split system.
Terry McIver, Content Director, ContractingBusiness.com magazine.