seatings for grab rails

Captain Coochie

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I'm in the process of making some new grab rails for Cuchilo and rather than fix them down on a bed of mastic i wondered if there was a water proof type padding i could use . I'm sure i have seen this type of thing before but cant for the life of me think of the product name . Any ideas ?
 

mitiempo

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A good sealant is a better choice, as it has to remain flexible and should stick to both surfaces. Gaskets I have seen used usually dry out, let water in and lead to problems. Sika Flex 291 is a good choice.
 

Billjratt

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Would it be the same gasket stuff that comes with instruments and skin fittings?
It is like thin foam rubber sheet with a plastic film on one side and glue on the other.
Looks like it would keep out dust but harbour dampness, so I agree that goo from a tube would be my choice.
 

mitiempo

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That looks like what we call butyl - sort of like placticene in consistency and never dries out. On my boat every factory fitting above the waterline was sealed with this including the hull/deck join and all are still leakproof after 34 years. Excellent and my choice for any through bolted deck fitting except near fuel which dissolves it.
 
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