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Old 03-29-2011, 02:57 AM
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Default life seal or 4200

I'm installing two new transducers and trying to decide what to use as a sealer around them and the screw holes.I've read about life seal but not sure where to purchase it.
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Old 03-29-2011, 03:37 AM
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5200 below water line
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Old 03-29-2011, 04:44 AM
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lifeseal is exquisite below the waterline for a sealer. Do not use 5200. 5200 is mostly an adhesive, and not as much a sealant. 4200 is more of a sealant, with stronger adhesion than lifeseal.

Life seal will be available pretty much any marine store, but sadly costs of lifeseal and 4200 are basically the same. Lifeseal is easier to clean-up, and you never have to worry about taking it apart. That said, 4200 CAN come apart if needed. Tough call. I usually say lifeseal if there is another means of mechanical fastening, because the product is specifically made to do exactly what you are asking it to do. 5200 and 4200 have become "old faithful" in terms of ANY kind of sealing and/or gluing in boats. This will eventually lead to boats with sloppy home-jobs with 5200, that you need to remove and clean-up, which will be a REAL hastle. My vote is for lifeseal, but between lifeseal and 4200, neither would be a bad choice.
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Old 03-29-2011, 06:57 AM
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5200
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Old 03-29-2011, 08:27 AM
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Old 03-29-2011, 08:47 AM
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As others have noted, 5200 is the best sealant below the waterline, or when screws penetrate wood. In other threads, some folks cite difficulty removing items sealed with 5200. This spring, I removed screws from two transom mount transducers that the marina forklift wrecked (both were installed by me with screws dipped in 5200). I got the screws out with no problem using a 12v cordless drill. I redrilled with a 1/8" bit to remove cured 5200 and reinstalled screws dipped in 5200 (and raised the transducers a bit). I have also removed outboard mounting bolts sealed with 5200 with no problem. 5200 has always done a great job at keeping water out of plywood on boats.
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Old 03-29-2011, 08:52 AM
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Life Seal or 3M 101
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Old 03-29-2011, 08:56 AM
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My installer swears by 4200. Even 4200 over 5200 because he says 5200 under the waterline may crack. I personally have used both 4200 and 5200 under the waterline.
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Old 03-29-2011, 09:16 AM
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5200 is not the best sealant. It is primarily an adhesive. It is to be used like an epoxy that stays somewhat flexible. Never to be used on something that will or may have to be removed. It is no better at seaing then 4200. In fact, because it is less flexible, it may be a little less forgiving as a sealant. I really see no place for 5200 on a boat. The only thing I have used it for is to glue a block of wood to mount a stereo box to. Since I work on boats a fair bit, I would like to see the stuff outlawed!
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Old 03-29-2011, 09:25 AM
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Quote:
Originally Posted by Mr. Demeanor View Post
5200 is not the best sealant. It is primarily an adhesive. It is to be used like an epoxy that stays somewhat flexible. Never to be used on something that will or may have to be removed. It is no better at seaing then 4200. In fact, because it is less flexible, it may be a little less forgiving as a sealant. I really see no place for 5200 on a boat. The only thing I have used it for is to glue a block of wood to mount a stereo box to. Since I work on boats a fair bit, I would like to see the stuff outlawed!
So what is your vote for this application?
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Old 03-29-2011, 09:41 AM
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I like Fast Cure 4200. Get youself some charcoal lighter fluid for cleanup. Takes it right off as long as its not cured. Probably just kerosene but it comes in a nce squeeze bottle.
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Old 03-29-2011, 09:42 AM
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cool, thanks
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Old 03-29-2011, 02:17 PM
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thanks guys,all good info but i'm still not sure.It's between the 4200 and lifeseal.
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Old 03-29-2011, 02:23 PM
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Originally Posted by rla69 View Post
thanks guys,all good info but i'm still not sure.It's between the 4200 and lifeseal.
Just use either one.
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Old 03-29-2011, 02:47 PM
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lifeseal
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Old 03-29-2011, 02:58 PM
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Quote:
Originally Posted by Chiefsurfer View Post
lifeseal is exquisite below the waterline for a sealer.....
Excellent description.
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Old 03-29-2011, 03:54 PM
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Quote:
Originally Posted by Mr. Demeanor View Post
I like Fast Cure 4200. Get youself some charcoal lighter fluid for cleanup. Takes it right off as long as its not cured. Probably just kerosene but it comes in a nce squeeze bottle.
Mineral spirits cleans it right up as well!
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Old 03-29-2011, 04:27 PM
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Quote:
Originally Posted by uncljohn View Post
5200 is a sealant with exceptional adhesive qualities. 4200 is a sealant with slightly less exceptional adhesive qualities.

In contrast, silicone (by itself) is a sealant with minimal adhesive qualities.

People don't use 5200 on their thru-hulls b/c of its "not much of a sealant".

In a high-pressure area, a sealant is only as good as its adhesion. In low-pressure areas, the amount of adhesion matters less, but still delivers a prefectly good seal.
wrong uncljohn, 5200 is an adhesive with sealant qualities. And when there are mechanical fasteners involved, the adhesion strength of a seal, is almost non-existant. Without mechanical fasteners, absolutely.

Quote:
Originally Posted by kgreggfl View Post
As others have noted, 5200 is the best sealant below the waterline, or when screws penetrate wood. In other threads, some folks cite difficulty removing items sealed with 5200. This spring, I removed screws from two transom mount transducers that the marina forklift wrecked (both were installed by me with screws dipped in 5200). I got the screws out with no problem using a 12v cordless drill. I redrilled with a 1/8" bit to remove cured 5200 and reinstalled screws dipped in 5200 (and raised the transducers a bit). I have also removed outboard mounting bolts sealed with 5200 with no problem. 5200 has always done a great job at keeping water out of plywood on boats.
5200 is not primarily a sealant. I agree, it isn't AS immovable as people make it out to be, but it depend on the application. If you are using it on a few screws, it is very easy. If you are putting in a flush-mount thru-hull, that's a WHOLE lot more surface area to hang onto, and it does get VERY hard.

Quote:
Originally Posted by Mr. Demeanor View Post
5200 is not the best sealant. It is primarily an adhesive. It is to be used like an epoxy that stays somewhat flexible. Never to be used on something that will or may have to be removed. It is no better at seaing then 4200. In fact, because it is less flexible, it may be a little less forgiving as a sealant. I really see no place for 5200 on a boat. The only thing I have used it for is to glue a block of wood to mount a stereo box to. Since I work on boats a fair bit, I would like to see the stuff outlawed!
Mr. Demeanor is right. Can't find it anywhere right now, but on a 3m brochure they say themselves, that 5200 is an adhesive with sealant properties. 4200 is a sealant with adhesive properties. Just because it is the strongest, does not mean it is the best for the situation. I mean, why would they make anything other than grade 8 bolts. They are the strongest, so why would you even make grade 5 and grade 3? The reason is because they fulfill needs. No need to use an adhesive when you can use a sealant.

Last edited by Chiefsurfer; 03-29-2011 at 04:40 PM.
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Old 03-29-2011, 05:13 PM
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Life seal.
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