Last one has been on now for about 10 years, maybe got another few years before another one is due. A/C is hangared
Oh that is a surprise. So it's hangared in a normal fully enclosed hangar with reduced light / UV conditions? Surprised to hear it would only last 10 years or so. My paint is 10 years old and I wouldn't dream of having to do anything with it.
Is it in a school or charter arrangement and left out in direct sunlight regularly? If not, how many hours do you do / how often do you use it and leave it outside?