Lu: yes, yes, don't stop now, keep going!
OK, so far so good, now you've got me panting for more,
have any blade failures been blamed on solar radiation?
I grant the possibility of delamination & other ills, but have yet to see any rotors covered with sunshades (hangaring being a different phenomenon since the presumed motivations for hangaring can be so diverse . . .).
The f/w crowd occasionally cover their wings just to save the paint (or, more $$$$, fabric, when present). But wouldn't we see Robinson issuing safety notices against leaving blades exposed to sunlight if there was a safety risk from delamination?
(Or, conversely, if sunburned 12 year blades are experiencing "fatigue," can we believe that reducing sunburn below 10.001 years makes us safe from that fatigue? Sorry, brain fatigue from trying to devine the Robinson mythos.)