3M 5200

[JDAM]

There is an on line Surveyor - David Pascoe -who has a comprehensive web site and seems very well informed. He recommends using nothing but 3M5200 for setting deck hardware.

I have always stayed away from this stuff due to the adhesive qualities. He claims it enhances the sealing properties.

Any opinions?

[paulk]

This discussion comes up periodically on the Woodenboat website forum. The upshot is generally: use 5200 when you will never remove the thing ever again. If you need to open it up later, use something else.

[hamiam]

There is a product called Anti-Bond 2015 that will supposedly remove 5200, fyi..

[HeartofGold]

Here is a related question/comment. A rigger recently advised me to use 3M 4200 to bed plastic hardware (such as Harken block stands). It is a polyurethane product, but is allegedly more resiliant (removable) than 5200. Can anyone confirm or deny this or provide alternative recomendations for plastic hardware?

Doug

[windship]

5200 and 4200 are the same thing. They are polyurethane adhesive/sealants. 4200 has less adhesive strength. They will both take gel-coat off if not removed properly, and even then it''s iffy. If bedded correctly, they are easier to deal with when and IF the item has to be re-bedded or removed.
There is also polysulfide, such as ''Life Caulk'' that is also very good. This is also an adheisive/sealant and will rip-up gel-coat as well. I don''t use polysulfide much anymore because it doesn''t clean-up with alcohol...5200 and 4200 does.
As for plastic hardware other than plastic ports, you can place the item where you want it and just use 5200 on the screws themselves or you can mount the item an a piece of teak or starboard only bedding the teak or starboard. In some cases, it''s not a bad idea to lift the item up a little anyway.
When I bed something, I don''t worry to much about removing it, I worry about it leaking.

Dennis

[conrat66]

Recently talking with a friend that used 5200 to rebed hardware and says in less then one year badly leaking and the opposite of not being able to get things free they are coming loose, Anyone have any recent experience with the adhesive qualities or 5200 being bad?????????

[Cruisingdad]

My only negative experience is that the stuff works too well and getting things apart once it has set veers to impossible.

Yes, I realize this is an old thread.

- CD

[pigslo]

5200 is what I use although it is tough to remove, a knife will do fine.
pigslo

[SEMIJim]

FWIW: From my Airmar in-hull, adjustable angle depth transducer installation instructions:

DO NOT use an exoxy adhesive, polyurethane based sealant, or the previously recommended Boatlife(R) Life Seal(R) or 3M[tm] 4200.

The recommend instead a silicone sealant, such as GE Silicone I or Silicone II (mentioned by name). Note, however, this is not an application where the part would be expected to be exposed to much mechanical stress or to the weather.

Jim

[sailingdog]

Originally Posted by conrat66

Recently talking with a friend that used 5200 to rebed hardware and says in less then one year badly leaking and the opposite of not being able to get things free they are coming loose, Anyone have any recent experience with the adhesive qualities or 5200 being bad?????????

If the surfaces weren't prepped properly, it is very possible that it would start leaking in such a short time.

SEMIJim—

I generally prefer an oil-bath in-hull transducer installation, rather than using silicone sealant.