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Hi Margerush
I use Dicor Self-Leveling sealant, I have seen it in white & gray. Your RV dealer will have it or an equivalent product. Typically, from my experience, I haven't had a situation where I have needed to clean the old off, I believe each situation may vary & your common sense will prevail. Make sure the surface hasn't any loose dirt etc., nor any "wet" residual cleaning chemicals still on the surface. For sealing around "aluminum framed" windows or transition moldings I use "marine 100% silicone", pay the extra money for trustworthy brand...PLEASE DO... remove the old silicone before applying the new. In reference to my comment about quality silicone, I have experienced 2 things over the years, "poor quality" silicone contains a "salt or chemical" that reacts to the aluminum & corrodes, & some silicone do not "skin over" well & airborne dirt penetrates the surface adding to your continual detailing chore !
FullTilt
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