Author Topic: BOAT = Bust Out Another Tube (of sealant!)  (Read 382 times)

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Offline Villager19

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BOAT = Bust Out Another Tube (of sealant!)
« on: July 27, 2021, 06:47:52 PM »
BOAT = Bust Out Another Tube (of sealant!)

I had the hood popped on my CVX-18 and much to my surprise, saw daylight from below. We've been getting a little (not a lot) of water in the bilge and wondering where it was coming from. From the looks of it, the water could be coming in from the joint between the deck and the hull, right above the transom. See frownie face for daylight, and a frown.

It looks like this may have been sealed in the past, since there is some residue. Does anybody have any recommendations on sealing this up? I am not going to take the deck off, I'm just looking to apply something to the outside of this joint.

I found some tape and also various sealants and caulks on Amazon, but also some notes on products that may damage the fiberglass in some way, or not stick.

For example:
https://www.amazon.com/Seal-Bond-105-Black-Industrial/dp/B07SRCL6R6/
https://www.amazon.com/XFasten-8-Inch-30-Foot-Sealing-Patching/dp/B06WLQ3WLS/
https://www.amazon.com/Sikaflex-291-Adhesive-Sealant-Cartridge-Black/dp/B00C501KD4/

If I could pick, I would prefer a black sealant/caulk or tape to clear, but I'm really looking for what will stay flexible in the summer heat and winder colds. I store the boat in an unheated barn in the winter.

FYI I am heading up to Wisconsin on Sunday for some boating, so ideally I can find something that ships quick/can be purchased locally at a hardware store and also sets quickly. I want it all, right?? Any recommendations are appreciated!


Illinois Dave

1979 Glastron Carlson CVX-18

Offline Villager19

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #1 on: July 27, 2021, 06:50:08 PM »
Here's an interesting read on the subject - comments on this article are welcome, too!

https://www.westmarine.com/WestAdvisor/How-to-Select-Sealants-and-Caulk
Illinois Dave

1979 Glastron Carlson CVX-18

Offline fireman24mn

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #2 on: July 27, 2021, 06:54:14 PM »
3m 4200 or 5200 you can get it in black.
I think this has become an addiction.


1977 CV-23 I/O Full Resto complete
1976 CV-16 V8 Resto in progress
1985 Pearson MotorYacht 43ft

Offline Hyperacme

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #3 on: July 27, 2021, 07:10:05 PM »
I used 3M 4200 around joints and trim pieces ..
Stuff stick to gel like crazy !

Offline Plugcheck

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #4 on: July 27, 2021, 07:30:54 PM »
Home Depot sells a marine sealant in tubes that is very similar to the 3m product (5200).
Michael
1979 CVZ-18 388 CI Vortec Mouse
1980 CVX-16SS 140 Mercruiser
1979 CVX-16 Johnson 175
2002 Bennington 2275CC 90 Mercury
1985 Intimidator project
1989 Lowe 200 Redneck fishin Toon
2001 Godfrey Sweetwater pontoon 115 Rude

Offline Plugcheck

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #5 on: July 27, 2021, 07:34:37 PM »
A few dollars a tube cheaper, but they also carry 5200.   PL Marine,.   https://www.homedepot.com/p/Loctite-PL-Marine-10-fl-oz-Fast-Cure-Adhesive-Sealant-2016891/206156418
Michael
1979 CVZ-18 388 CI Vortec Mouse
1980 CVX-16SS 140 Mercruiser
1979 CVX-16 Johnson 175
2002 Bennington 2275CC 90 Mercury
1985 Intimidator project
1989 Lowe 200 Redneck fishin Toon
2001 Godfrey Sweetwater pontoon 115 Rude

Offline still_fishin

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #6 on: July 27, 2021, 09:28:29 PM »
Im a bit fuzzy here but a seem to remember one of the 3m sealants, 5200 or the 4200, sets up quite a bit quicker.  Im thinking the 4200. I've used both with great results when I gave it enough time to fully cure.  That last sentence is important..... really.....I used some 5200 on a fishing boat below the water line that didn't have a full cure.  Yep,  they failed and the water did what it does. Ive found it at our local marinas and the ace hardware in town.

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'85 CV23

Offline still_fishin

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #7 on: July 27, 2021, 09:29:59 PM »
Don't forget to check the areas under the rub rail on either side of the transom.  Mine leaked there when coming off plane

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'85 CV23

Offline thedeuceman

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #8 on: July 28, 2021, 06:23:52 AM »
There is also a 5200 “fast cure”
Sets in 24 hr.


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Joe
92 16CSS "Attitude Adjustment"
75 CV-16V8, Project

Offline aquamaniac

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #9 on: July 28, 2021, 03:42:14 PM »
3M 5200 is great stuff but it is a strong permanent adhesive. Boat Life Life-Calk remains flexible and won't harm gel. It adheres to fiberglass but can be removed. You can buy it from Hannay's

Offline Villager19

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #10 on: August 02, 2021, 07:59:25 AM »
Thanks everybody! We went with the 3M 4200. It says that its fully cured in 24 hours, but we gave it 36.

We lightly sanded a little area on the hull and deck first. Then we wiped down that area with acetone, using a lint-free rag. We taped the hull for a clean line and used some big popsicle sticks to try and smooth it out.

We did not have time to check the rub rails. We're on the water this week, so if it doesn't work, I'll reply back asking for more help, lol!
Illinois Dave

1979 Glastron Carlson CVX-18

Offline Villager19

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Re: BOAT = Bust Out Another Tube (of sealant!)
« Reply #11 on: August 02, 2021, 08:04:07 AM »
Finished product, looking a little nicer!
Illinois Dave

1979 Glastron Carlson CVX-18