We've always completely blacked them out and insulated them. There are a few pictures in our photo album "Forester Modifications". Remove inner panel, painted inside of upper dome, painted top side of inner dome, cover in reflective bubble wrap, put batten insulation in, resecured inner panel. Keep the head room, lose the heat and light. On the forester the upper color ended up matching the motorhome, however all the others I've done were white, which is probably better. We've done this to every one of ours, and to a few other people's RV's that liked the idea. Only thing, it's permanent, and if you like the light, it's a bad idea. I've seen others who have coated the top side of the dome with various coatings, and that works too. Just an idea.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.