Problem with "Back to Black" is that it is a petroleum based "cover up" product, similar to Armor All. All it does is cover up the problem for a week or so. You'll notice the first time it rains or the boards get wet, the boards will be back to their chalky white status. You could put any oily or greasy substance on the black portion of the boards and get the same results.
There are only two products that actually work in this regard. They require periodic application for maximum protection against degradation. The first is 303 Aerospace Protectant. It works. The second is available at Wal Mart in the Marine section called 3m Vinyl and Rubber Restorer/Conditioner. The 3m is better for already damaged items. I put it on a Geo Metro's bumper covers (gray plastic) after they had turned chalky white from neglect. Soaking this stuff on twice for two days made the bumpers look NEW. The benefit was that even withOUT repeated applications the bumpers NEVER got as bad as they were previously. So, I'd use a few applications of the 3m stuff, get them new looking, and protect them with 303. Same for dried weatherstripping.
I spent extensive weeks about 2 years ago evaluating all available "black rubber" treatments. Besides 303 and the 3m marine stuff the only other good product was "Nu-Vinyl", made by Nu-Finish. But, I don't think you can find the latter anymore.
Just thought I'd pass along my experience. I hope I didn't test all that stuff in vain!
SANDY
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