ASA and PSIA Instructor
Join Date: Apr 2000
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You should try to figure out what type of paint you have. If it is a hard paint or a one-season ablative (which I've never seen...), then in general you should put a fresh coat on every year, and every 6-8 years you need to remove them all and start from a bare bottom.
If it's an all season ablative, you don't want to produce a buildup of paint, so you only want to paint when the paint is getting thin, usually demonstrated by some visibility of what's under the paint: glass, barrier coat or a different color base coat.
Can you find out fromthe PO what paint was used? If not, you might see if the yard can id the paint.
Certified...in several regards...