No avionics cover glare problem with my shiny/unpainted RV-12 in sunny California. I did visually notice a bit of oil-canning on the flat portion of the avionics cover, but a small piece of
Dynamat anti-vibration mat addressed that issue. Now the sun's glare off the unpainted wings is another matter.....!!

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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 940+ hours (as of September 2020)!

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AF donation through June 2021.