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I've heard the same from others. I've also heard the exact same about silicone. Once you apply it dries rubber/plastic out. I have noticed that on the outside of my tires I have some mild cracking, but on the inside (which has only seen water) no cracking. A buddy of mine "borrowed" some silicone from work and applied it to his dash. It cracked like hell in less than a week. He swore up and down it was the silicone and it needed to be diluted. I'm sure it could have been the car's age (99 Caddy), but he really seems to keep it up well (Always spotless). I've also tried the Advance Auto Parts brand stuff which seems to be silione by the color/texture. Any recommendations on a product?