Blocking the sun in sunroof

[serialk11r]

How about metallic window film (for home windows)? I've done it myself once, it's not that hard and since you're not putting it over the windshield or side windows it doesn't have to be perfect.

For side windows and windshield, 3M Crystalline film is very expensive but almost like magic. My windshield has it and my side windows don't, and the direct sunlight coming through the windshield feels cooler than the highly refracted light coming through the sides at noon.

Metallic film on all windows would kill GPS signal, but on the sunroof I imagine it can't be much of a problem if most cars have metal roofs that don't cause problems.

[j12piprius]

There are 4 types of window film, with dyed being worst, metallic, carbon, and nano ceramic having the best performance. Ceramic keeps out more heat than metallic, doesn't block signals, and allows maximum day and night visibility. Ceramic tints vary in their ease of shrinking to fit curved surfaces.

Different Types of Window Tint Film

My understanding is that flat window films don't shrink well on curved surfaces, but might be okay for moon roofs.

Another option is Rustoleum white paint, which adheres quite well to automotive windows.

[Xist]

I believe the dyed tint is what they offer at the bargain tint places. When I had tinting put on my Forester they pointed at a window across the street. The guy says it was dyed tinting and was all messed up.