Have a gray, 18' Aire cat, almost 20 years old, surface stays comfortable in the intense sun. I look at all the scrapes, discolorations, etc. and fondly remember each trip by those marks!
Also have a 14' Saturn raft (yes, I have, use and like it!), medium blue...had it both on Deso this past June and had no problem keeping either cool with river "wash".
"If you understand, things are just as they are; if you do not understand, things are just as they are."