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Old 03-26-2009
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Sealant recommendations

I am about to rebed my stanchions and I have heard recommendations to use 3M sealants ranging from 101to 4200. What experiences and/or observations have people out there to share? I already know to stay away from 5200.
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Old 03-26-2009
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I have alway used Sikaflex 291 - it's the best!

Sikaflex®-291 is a one-component, low viscous, medium modulus, polyurethane-based sealing/adhesive compound. This all-purpose grade is used for general sealing applications such as deck hardware and equipment.
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Old 03-26-2009
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SikaFlex 291 or 3M 4200 are good choices. For stanchions, you can also, often use, butyl tape. Please note, butyl tape is what you get at a glass repair shop, and comes on a roll with paper backing, not in a tube and is not a caulk-like product, and looks like this:

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Old 03-26-2009
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sika 291 is excellent, but will yellow if exposed to sun. for sun exposed areas sika 521-uv is just as good and will maintain a color.

3m 5200 is an excellent *adhesive*. I did not like their products as sealants, though. YMMV.
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Old 03-26-2009
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I agree with all the others about SikaFlex 291, great stuff.
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