What type of waterproof sealant to use?

RazzRoach

Well-Known "Member"
Jun 13, 2019
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Took of the center of my boat to clean the fuel tank and hull. There was a black strip running along the edge when I pulled the center off. The strip is old and coming off so I want to replace it with something new that will offer a more waterproof seal to prevent water going down into the hull when I spray down the deck. Should I get another black strip or run a thick bead of silicone? My friend recommended 5200 but I don’t want it to be sealed shut so I can’t remove it in the future. What type of silicone should I use or should I just replace with another black sealant strip! Thanks for the advice guys. Btw pic was before cleaning... look how dirty it was down there. Also cleaned up all the wiring with come cable ties

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dragonballs

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Use 4200. It won’t be as permanent.
 

RazzRoach

Well-Known "Member"
Jun 13, 2019
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Use 4200. It won’t be as permanent.
With the 4200 will I be able to pull it off easily or will it take some work to get it off. The problem is I am unable to get a razor blade or putty knife in there to cut the sealant due to the angle. With the top on it’s about 2 inches down and a right angle to reach the sealant strip
 

dragonballs

I'm off probation
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If you can get a heat gun close all sealants become pliable.
 

gecsr1

28' Aquasport "Reel Adventure II"
Jul 15, 2005
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another black sealant strip would be the best option and silicone it down on one side only
good luck , I would use 5200 or 4200 or silicone , it may not come off again...

Good luck
 
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Capt.C.Delany

The only fishing I do is trolling the Internet
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Looking at the pictures I would probably opt for silicone. The reason being is both 4200 and 5200 are adhesives whereas silicone is a sealant.

In a perfect world I would feel more comfortable using 4200 but the problem you will run into is trying to pull it free in the future. Yes you can use a heat gun to loosen it but the location for getting the heat to it looks tricky because the deck sits on top of it. That would require getting the deck pretty damn hot for it warm up the 4200.

The other issue is you probably cant get a pry bar in there without potentially messing up the surrounding areas.

The other good method to break 4200/5200 is using braid. That might work in your situation. Take a long piece of braid and tie a dowel rod to each side. Use it as a saw to cut through it. That might actually work decently for your situation. even if you can't cut the entire seam it would be enough to weaken it.



Just my .02.
 

gecsr1

28' Aquasport "Reel Adventure II"
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McMaster Carr catalog. Neoprene foam rubber strips. Overwhelming choices, hardness, width, height,
We don’t calk them down, impossible to remove.
Just my way of thinking
McMaster-Carr awesome choice for stuff...
 
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Derby

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Sep 9, 2010
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If you insist on 3M...4000 is what you should use.

On my tank lid, they used plumbers putty....back in 1979, Worked good enough to keep original tank clean and dry for 30 years, I used it again.

You want a seal that is removable and easy to clean when you need to reopen and reapply.
 
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plj46

I've posted enough I should edit this section
Jan 7, 2008
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Even if you use silicone or a lesser grade sealant that cover isn't going to come off easily.Use a quality weather stripping.Maybe even that zinc chromate putty tape they use on aluminum window frames.