In addition to what has been said already:-

I know that at least some good quality pre pregs have UV inhibitors in the resin to protect from UV.

Also a good quality pre preg will have a relatively high cure temp and if you elevate the cure temp, in accordance with resin recommendation, towards the end of the cure cycle that can help the laminate withstand extremes of heat caused by the sun.

If you are not using pre preg get a resin with data sheets that detail the vacuum window. Weigh everything and follow the data sheets to avoid resin starvation in the laminate. Alternatively don't pull too high a vacuum.
Also post cure the laminate but I would still paint it white.

If you did not make it yourself and not privy to all the details paint it white.