Couldn't find anything on my kayak forums or a google of the net concerning Vaseline petroleum jelly being used on the hull of a kayak.....for anything. 
Some do use it to temporarily mount a transducer, thru hull, for their fish finders. 
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"Government is not reason, it is not eloquence, it is force; like fire, a troublesome servant and a fearful master. Never for a moment should it be left to irresponsible action.....Unknown....but attributed to George Washington
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