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I wouldn't use Silcone under water -- it won't hold-up as long as other products
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I had the same question and contacted Forespar...
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Bedding marelon fittings
Marelon
If you have a cored hull, seal the edges of the hole with epoxy before you use the sealant for the thru hull.
Boat US and Practical Sailor have both reported on caulks. A lot depends on your caulk "number" but...
Below taken from Forespar site....
There's more info on that site, look for "how to, Marelon"
Couldn't stand it, here's the site link...
I see this site info is a bit different from what I quoted earlier...go figure.
I'm with you. 5200 below the water line.
Usually, the sealants that smell like vinegar
I had the same question and contacted Forespar...
I wouldn't use Silcone under water -- it won't hold-up as long as other products
Let me clarify...
My boat came with silicone
LifeSeal from BoatLife.
Polysulfide and Polyurethane caulks are okay for most plastics.