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Old 29-07-2014, 18:59   #1
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3M 5200 Adhesive

My friend has a hole about the size of a dime in the upper corner where the bobstay is at. It's been there since he bought the boat (6 years ago) and the previous owners said that it had been there since they first purchased it. It doesn't seem to be causing any problems and somehow there's like zero moisture in it. But how should it be fixed? Can 3M's 5200 sealant do the job? Or would you suggest marine tex or a fiberglass epoxy?
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Old 29-07-2014, 19:19   #2
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Re: 3M 5200 adhesive

You sure it is not the drain for the anchor locker.


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Old 29-07-2014, 19:59   #3
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Re: 3M 5200 adhesive

5200 is not really a sealant, it is an adhesive.

SATAN'S GLUE.

Beware and be careful of its use. My feeling is that the only place it belongs on a boat is the hull to deck joint. Years ago someone mentioned another "acceptable" use, but I'm sorry, I forgot what it was.

Holes in a boat can use butyl tape by Maine Sail. Good stuff. Best under compression, but I use it for chainplates, too.
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Old 29-07-2014, 20:09   #4
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Re: 3M 5200 adhesive

Marine Tex is fine for filling small holes, like old screw holes. West System epoxy with some thickening additive is even better. I found that even the white marine tex will yellow from UV, so you need some paint over it.

Ideally some bevelling along the hole edges helps the strength of the repair. When filling screw or drill holes, I simply use a countersink bit to bevel the edges of the hole.
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Old 29-07-2014, 20:12   #5
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Re: 3M 5200 adhesive

Quote:
Originally Posted by The Garbone View Post
You sure it is not the drain for the anchor locker.


Gary
Or the vent for the holding tank
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Old 29-07-2014, 20:12   #6
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Re: 3M 5200 Adhesive

Despite other opinions I am a great fan of 3M5200, but this seems to be the proper place for an expoxy solution.
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Old 30-07-2014, 13:24   #7
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Re: 3M 5200 Adhesive

Bevel the edge and fill with thickened epoxy if you must fill it. to do it right, you'd need to sand the patch smooth/flush which will make a more obvious spot than than the current hole. Epoxy is not UV resistance so will yellow and the surface break down unless you paint over it.

Sounds like it's not hurting anything so filling is strictly cosmetic. Of course, be sure it's not there for a purpose before filling it.
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