Hugo,
DICOR is one of the few sealants that will adhere to itself. The "general guidance" from DICOR is to clean the sealant beads, carefully inspect the margins and remove any "non-adherent" sealant by cutting it away "back to where it adheres to the surface properly". Once that is accomplished, wipe down the sealant surface with alcohol (or other approved solvent) to remove all contaminats, oils or grease that might have come from fingers, gloves, etc. Allow that to dry, then apply a fresh coat of DICOR sealant directly over the surface, overlapping the old sealant, allowing at least a 1" margin of fresh sealant in contact with the surface being covered.
DICOR self-levelling and DICOR non-leveling sealant are compatible with each other and there is no need to remove "all the old sealant". The company suggests that any "damaged or non-adherent sealant be removed before fresh sealant is applied to the surface.
It's my understanding that anything with silicone in it will not adhere to itself. I do not use any sealant with silicone on my RV "anywhere"... And, I completely avoid the $1.99 tubes of "latex caulking with silicone" for use on anything I own. Whether it's a "knot hole in an old lawn chair" or a loose piece of vinyl siding, that crap is exactly that: CRAP.
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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