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 Flex-Seal Paste

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T O P I C    R E V I E W
GaryB Posted - 07/11/2021 : 15:36:49
Anyone thought about using Flex-seal Paste to make gaskets to go under things like the handrails on the cabin top rather than use butyl tape?

Thought if a person made a small mold you could fill with the paste, let it dry, pop out, then make more gaskets.

Also, not sure how it would hold up to UV over time.

Thoughts?
7   L A T E S T    R E P L I E S    (Newest First)
Leon Sisson Posted - 07/16/2021 : 07:33:47
Having worked with butyl tape recently, that stuff is definitely adhesive!  Like bubblegum on a hot sidewalk.
Stinkpotter Posted - 07/14/2021 : 20:26:30
Cork is permeable... works inside wine bottles when sealed on top with wax, lead, or plastic. It might prevent water from rushing into a deck into a cabin or hull, but not necessarily from seeping into deck or cabin core.
Voyager Posted - 07/14/2021 : 19:08:41
Right. The compass has a rubber gasket that’s still fine after all these years. The depth gauge body on Passage is made of aluminum, and that’s bedded onto the cockpit bulkhead with polysulfide. I believe that if I needed another gasket, I’d probably either use some butyl tape or maybe some cork sheet (if that’s still a thing).
Stinkpotter Posted - 07/14/2021 : 13:52:49
Bruce: Polysulfide is considered incompatible with most plastics. I use Life Seal for bedding plastic--it's a polyurethane-silicone formula that adheres well but is removable without taking gelcoat with it or leaving a silicone residue. (I think it's a little less adhesive than 3M 4200.)
Voyager Posted - 07/12/2021 : 17:19:30
Might be useful to back up a compass mounted on the cockpit bulkhead or for any instrumentation mounted there. I used polysulfide to bed the depth gauge housing and now I’m noticing crazing in the material. It gets a lot of sun right there.It doesn’t leak yet but you never know.
GaryB Posted - 07/12/2021 : 15:34:47
I see your point and it is valid.

My thought was for the handrails anyway, the mounting surface is smooth so tightening the "gasket" down firmly would seal out the water much like a gasket on a car engine. Like the gasket on a car water pump.

It was just a thought. :)
Stinkpotter Posted - 07/11/2021 : 20:28:28
Opinion: "Gaskets" aren't like bedding compound--they aren't adhered to the surfaces above and below them, thus, especially on nonskid, will not seal as well. We're not dealing with machined metal surfaces... As I understand it, butyl tape is sort of in the middle--conforms but isn't adhesive... I've never used it--I'm a Life Caulk and Life Seal guy--I tighten gently, let it set up, and then tighten just a little more (from the bottom, to avoid turning the bolt). Also, I champfer the tops of the holes a little (oversize bit turning in reverse) so more sealant is around the bolt. I have no evidence whether that helped or not.

YMMV.

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