Keel bolt cover

Mark Pitt
 

There is a keel bolt near the C drive that is covered in a thick black rubber sealant.  The sealant does not appear to be silicone based.  I have a tear in that black rubber cover, revealing the head of the bolt.  What product should be used to re-seal this bolt?  There are a number of “liquid rubber” products on the market.

 
Mark Pitt
Sabbatical III, SM419

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