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Old 29 June 2013, 14:04   #1
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Less permanent sealants?

Hi,

So I am familiar with 3M 5200 but I was wondering if there was a sealant that wasn't quite as permanent? I would like some of my fittings to not be that permanent. Things like the transom cap and other transom fittings I would like to be bedded but don't need to be there forever.

Thanks
Jason
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Old 29 June 2013, 15:09   #2
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Over here most people use Sikaflex 291. I'm not familer with 3M 5200 but taking a whild guess it's probably quite similar? (White sticky goo). It can be tricky to get things off when they've been bedded in with it but it is possible with the right tools (knife). Of course, if you use something inferior eg silicone water is going to be able to get in there more easily.
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Old 29 June 2013, 15:25   #3
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5200 is a polyurethane based "permanent" sealant; (like the Sika Tim mentioned, I think. We don't get a lot of Sikaflex products here in the US except for construction adhesives.)

4200 is 3M's "removable" stuff. Also polyurethane based, fast cure (24 hrs.)

3M 4000 is a polyether sealant/adhesive (their term; it sounds like what a lot of companies call "caulk"); white only, 24 hr cure.

Just noticed that West Marine does carry Sika 291 and some other flavor. Didn't see that before.

jky
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Old 29 June 2013, 15:25   #4
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Quote:
Originally Posted by Tim M View Post
Over here most people use Sikaflex 291. I'm not familer with 3M 5200 but taking a while guess it's probably quite similar? (White sticky goo). It can be tricky to get things off when they've been bedded in with it but it is possible with the right tools (knife). Of course, if you use something inferior eg silicone water is going to be able to get in there more easily.
Sikaflex 291 is very similar to 52 hundred as the Americans call it

Sticks like sh1t and a pain to get off but does an excellent job.
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Old 29 June 2013, 17:43   #5
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Sikaflex 291 is very similar to 52 hundred as the Americans call it

Sticks like sh1t and a pain to get off but does an excellent job.
THe new stuff -291i- will come off with a lot of rubbing with acetone,even when long set.
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Old 30 June 2013, 00:13   #6
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Thanks guys. I think that should get me going.

Jason
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Old 30 June 2013, 03:39   #7
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THe new stuff -291i- will come off with a lot of rubbing with acetone,even when long set.
Yes, and its also softer when hardened than the good old 291, not that difficult to remove.
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