I'd appreciate feedback on your experience of sealants for plastic boats. I need to seal up the rudder mount on one of my kayaks and have used silicone in the past, but I'm finding it has a limited life. Goop apparently does not bond with plastic. What else do you recommend?
Thanks in advance.
Touring Kayak Paddles
Full Size Sail Rig
4-place Boat Trailer
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Posted by: FrankNC on Jun-29-10 9:48 PM (EST)
best sealant I've used. Although silicone sealants have worked OK most of the time.
You may have screwed yourself...|
Posted by: BNystrom on Jun-30-10 9:12 AM (EST)
...by using silicone sealer, as it leaves a residue that prevents anything else from bonding. That's why it should never be used in a kayak. Polyethylene (I'm assuming that's what you mean by "plastic") has a somewhat porous surface, so getting the residue off may be difficult. There are "silicone sealer remover" products on the market and I understand that hexane will remove the residue as well. Barring that, clean the area with whatever strong solvent you can find (polyethylene is impervious to solvents), such as acetone, lacquer thinner, MEK, etc. Once you've cleaned it, use a product like Lexel, Goop or 3M 5200/4200 as a sealant. Note that the latter two require considerable curing time.
Posted by: old_user on Jun-30-10 12:18 PM (EST)
Just resealed the foam bulkheads for my friend's new (to him) 2008 P&H Capella. Nice neat job. I very lightly routed out a groove in the foam so the Lexel seated in there tight to the floor and sides of the kayak.
Posted by: Paddler.Poet on May-13-12 12:32 PM (EST)
I've seen a few folks praising Lexel, but in this data sheet from the manufacturer, they claim that Lexel is incompatible with Polyethylene:
G-Flex by West Systems|
Posted by: trilliumlake on Jun-30-10 1:41 PM (EST)
I've had good results with G-Flex on both polyethylene and thermoplastic boats. The key to G-Flex is to follow the prepping instructions very carefully, especially on poly.
Call West Systems|
Posted by: old_user on Jun-30-10 2:52 PM (EST)
They're known for being super helpful - I'd try calling them to see what they suggest about the silicone.