Has anyone put reflective film on the topside of a sunshade that protects unwanted sun (and heat) ?
Not me. The current coating works well for me. I’ In Philadelphia, PA.
I get the strong, high altitude sun of Colorado and no need for additional block.
I tinted the top 6" of the windshield with 5% darkness. Never had an issue with it...
In 6 years...
In CA, you're only allowed film in the 4" from the top of the windshield. How that makes sense with the glass going to the back may be hard to interpret. Likely not a real issue.
I put my windshield sunshade there to block the sun.
I have the darkest shade just before blackout and I still get heat. I'm bald and in Dallas, TX. I feel the heat on those midday sunny days. I will be able to watch the eclipse with my sunglasses - LOL.
The factory tint blocks all UV rays and about 85% of the heat.