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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 03-17-2009
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3m 5200

ATTENTION

Unless you work in a boat yard and know exactly what you're doing, 3M 5200 should never, ever be used on your boat. Never.

It is appropriate for: Keel/hull joints and hull/deck joints.

3M 4200 should almost never be used.

Bedding and sealing require sealants, NOT ADHESIVES.


Mods, I'm sure you'll see the wisdom of this post and make it a sticky.


CARRY ON
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Old 03-17-2009
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Well said

Words of wisdom...!!!!
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Old 03-17-2009
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Huh??
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Old 03-17-2009
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OK Pal since you are so damn smart tell us why.

And BTW. Stop f*%$ing shouting.

Quote:
Originally Posted by NOLAsailing View Post
ATTENTION

Unless you work in a boat yard and know exactly what you're doing, 3M 5200 should never, ever be used on your boat. Never.

It is appropriate for: Keel/hull joints and hull/deck joints.

3M 4200 should almost never be used.

Bedding and sealing require sealants, NOT ADHESIVES.


Mods, I'm sure you'll see the wisdom of this post and make it a sticky.


CARRY ON
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Old 03-17-2009
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k1vsk will become famous soon enough
I think just simply saying is has uses limited to permanent bonds only is preferable as there are a myriad of uses for something intended to be permanent beyond a deck or keel joint.
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Old 03-17-2009
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It works great as the mechanical adhesive in a C-Flex job.
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Old 03-17-2009
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did I read 4200 is no good for bedding thru-hulls?

3M 4200 should almost never be used.
Bedding and sealing require sealants, NOT ADHESIVES
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Old 03-17-2009
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OK , I'm confused.
On the 3M site it recommends 4200 for sealing thru hulls ??
David
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Old 03-17-2009
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Quote:
OK Pal since you are so damn smart tell us why.

And BTW. Stop f*%$ing shouting.
Well, buddy, itís because 5200 and 4200 are prolific and in almost all cases, used for purposes theyíre not designed for. I see countless posts where people are asking which of the two is appropriate for a wide range of uses; the problem is that neither are appropriate. They are truly adhesives. In fact, they are very, very good adhesives. Used in the wrong way, though, they donít do the job right and, once used, often result in damage to the parts the unwitting owner wanted to seal and damage to the boat. For example, ports and hatches - NOT a place where you want adhesive. You want a pliable sealant, such as butyl caulk (if itís a plastic) or 3M 101.

I hope thatís helpful, champ. And I wouldnít shout if I didnít have to, but Iíve made post after docile post on this topic. So, Iíll yell a little. Wait Ďtil I get started on recoring and 2-part polyurethanes. Youíll hear me then, too. Amigo.

Quote:
did I read 4200 is no good for bedding thru-hulls?
4200 does have uses; though theyíre limited. Certainly thru-hulls are a good use. Iíve used 4200 for a number of things.

Both 4200 and 5200 are great products. They are just massively over-used. Thatís my point.

Quote:
Words of wisdom...!!!!
Thanks MaineSail! I have about six thoughts a day on average. Some are good, some arenít. This afternoon I had (1) 5200 is good for two things on boats and (2) I like bread. I thought the latter wasnít worth posting about. Until now.

Quote:
Huh??
You can say that again.
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Old 03-17-2009
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Recommendations?

I think it would be more helpful if instead of posting "don't use this!" someone with expertise and serious attention to detail (hint hint Maine Sail..) would post a list of recommended sealants to be used in a variety of situations. That way when some newby boat owner googles "deck hardware bedding" they'll get an authoratative list.

Not only that, but I'm once I get my manual windlass rebuilt I'm going to have to bed it to the deck with something....

Just my $.02
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