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  Sealant for through hull fittings?

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Author Topic:   Sealant for through hull fittings?
Swellmonster posted 10-20-2003 03:07 AM ET (US)   Profile for Swellmonster   Send Email to Swellmonster  
I replaced my livewell pump in my Outrage. Reading the directions, the directions said not to use silicone. Why?
kingfish posted 10-20-2003 09:11 AM ET (US)     Profile for kingfish  Send Email to kingfish     
Dunno - but I'd use 3M 4200, anyway...
lhg posted 10-20-2003 01:38 PM ET (US)     Profile for lhg    
I think for underwater installations, silicone caulking is not recommend, and does not hold up. Similarly looking polyurethane caulking, like Boat Life, is recommended.
Swellmonster posted 10-20-2003 06:16 PM ET (US)     Profile for Swellmonster  Send Email to Swellmonster     
Yep! It said to use the boat life. Is it readily available?

But the silicone said its flexble and waterproof and lasts a million years.

lhg posted 10-20-2003 07:50 PM ET (US)     Profile for lhg    
They have it in most marine stores. It's in a black, yellow and red tube, just like silicone and comes in clear and other colors. It does cost more. I just paid $11 for a tube from West Marine.
doobee posted 10-20-2003 09:17 PM ET (US)     Profile for doobee  Send Email to doobee     
An ancient surveyor told me that silicone is not as adhesive, so water will eventually get behind it.
Swellmonster posted 10-26-2003 02:53 PM ET (US)     Profile for Swellmonster  Send Email to Swellmonster     
Marine Max says they use 5200 on all through hull fittings. I thought that stuff was bulletproof. What happens when its time to remove it again?
jimh posted 10-26-2003 03:20 PM ET (US)     Profile for jimh  Send Email to jimh     
Numerous mentions of 3M-5200 have been made in forum articles. It is a very strong adhesive and is very difficult to remove.
kingfish posted 10-26-2003 03:51 PM ET (US)     Profile for kingfish  Send Email to kingfish     
3M 4200 (see my first post, above) works as well for all sealant and adhesive purposes I've found yet, but, as opposed to 5200, gives you a sporting chance to undo what you've done at a later date if desired.
Swellmonster posted 10-30-2003 08:04 AM ET (US)     Profile for Swellmonster  Send Email to Swellmonster     
Im going 4200 shopping today!!
Thanks guys!!
Montauk posted 10-30-2003 10:51 AM ET (US)     Profile for Montauk  Send Email to Montauk     
Swellmonster,
The reason to not use silicone for underwater sealant is quite simple and has nothing to do with intial adhesive properties. Silicone is not resistant to gas or oil, therefore can be dissolved if there is a tank or hose leak into the bilge area, causing your boat to take on water. An Adhesive is not needed or required for underwater through hulls, you rely on the mechanical fasteners to hold the piece on or together. A good polysulfide compound such as Life caulk is all you need, at the very most if it gives you comfort, use 4200.

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