Forever BLACK™ Black-Top gel will rejuvenate your faded sun-damaged tops (vinyl, convertible, bimini and soft tops) to a rich black luster. This environmentally friendly, silicone-free, black-pigmented polymer will keep your vehicle in tip "top" condition. With built-in UV protectants, Black-Top gel will protect your top from further sun damage.
Ive used 303 as well. I dont think it will do the color change you are after. I find it similar to a dark car needing a good wax. It will enhance but not change the color. A touch deeper color and uniform to me but not changed darker per say.
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