Your #1 source for kayaking and canoeing information.               FREE Newsletter!
my Profile
 





 
Advice, Suggestions and General Help New Topic Printer Friendly Version

  Best sealant for plastic boats
  Posted by: acadia on Jun-29-10 9:22 PM (EST)
   Category: unassigned 

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.

 Great Products from the Buyers' Guide:

Classic Freestanding Rack

GO Trailer/Camper

Full Size Sail Rig

ParkerMount

Paddler's Truck Rack

Table of Contents




Messages in this Topic

 

  3m 5200
  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.

NOTE: If your boat is thermomolded ABS or similar, be very careful with solvents as they can harm the plastic. Consult the manufacturer for their recommendations for removing silicone residue.
 
 
  Lexel
  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.

Lexel is recommended by people like flatpick & salty who post here often enough.... good enough for me. And it was easy to use. Lexel adapts very well to the inevitable flex where foam and plastic meet (some measure of flex is natural & good)
 
 
  Lexel?
  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:

http://www.sashco.com/hi/pdfs/Lexel_TechData.pdf

Anyone experience any problems with Lexel? I don't want to degrade my boat's material.

(Necky recommends MA300 by Plexus.)
 
 
  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.

However, I've never used G-Flex in the presence of silicone residue, so can't speak to what problems you may have with that.
 
 
  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.
 

Google
 
Web Paddling.net


Follow us on:
Free Newsletter | About Us | Site Map | Advertising Info | Contact Us

©2014 Paddling.net Inc.
Sweepstakes Banjo Shirt