mojoman, I agree with Mike. Lighter colors as a 'permanent' solution are probably not a satisfactory solution. I do use a solution, just not often.
If the dash sits in the sun, it gets hot. This can be a problem, Especially if the rest of the B is hot, driver hot........... I try to not let this happen prior to using the B. If that happens, I do not let the sun Hit the driver while driving using another solution. Then I'll use a couple of white t-shirts that need washing on top of the dash. This keeps the dash top from radiating heat, and the dash top starts cooling off.
I have no problems from heat, very cool in my B.