Sikaflex 291 LOT vs. 3M 4000 UV - SailNet Community
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post #1 of 17 Old 03-25-2010 Thread Starter
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Sikaflex 291 LOT vs. 3M 4000 UV

I need to fill an 1/8 to 1/4 inch gap between my topsides and the teak toe rail. I'm considering using Sikaflex 291 LOT or 3M 4000 UV. Coments? TIA
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post #2 of 17 Old 03-25-2010
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Why would you use a sealant to fill a gap? What is the cause of the gap? Do you have photos of the gap? Filling a gap is often better suited to something like a thickened epoxy, rather than a sealant or caulk.

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post #3 of 17 Old 03-25-2010
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Neither. I'd use Sikaflex 295UV or a Polysulfide like 3M 101 if you can still find it, since it has been discontinued. Life Calk is also a polysulfide. UV4000 bonds at about 300 PSI which is way to much IMHO just for gap filling as you will eventually need to reomve it and re-do it..

Dog is correct though in questioning what the gap is from and for as to which material is best suited?

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Quote:
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...a Polysulfide like 3M 101 if you can still find it, since it has been discontinued...
Argh, so that's the reason I can't find it easily. I really like my 3M 101. It doesn't turn yellow, and stays pretty darn soft for a good while. So is Life Calk the last of the polysulfides now? (Sorry not trying to hijack the thread)

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post #5 of 17 Old 03-25-2010
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Argh, so that's the reason I can't find it easily. I really like my 3M 101. It doesn't turn yellow, and stays pretty darn soft for a good while. So is Life Calk the last of the polysulfides now? (Sorry not trying to hijack the thread)
Unless you can find a source who sells the Thiokol stuff in small quantities, yes. Sadly the Life Calk has never held up for me or weathered quite the same as 101 did. Not a bad product but still not 101...

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post #6 of 17 Old 03-25-2010
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Life Calk will yellow as well...Im not a happy camper about the 101 deal.

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So what's the shelf life in an up-opened container? There's still some 3M 101 left around....

And any alternative's for general deck hardware bedding, where butyl tape isn't appropriate (like where some adhesive is needed)? Man, I'll miss my 101...

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post #8 of 17 Old 03-26-2010
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And any alternative's for general deck hardware bedding, where butyl tape isn't appropriate (like where some adhesive is needed)? Man, I'll miss my 101...
Which deck fittings need an adhesive?

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Quote:
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Which deck fittings need an adhesive?

We have a few items, for instance our chainplate covers and teak handrails (56 holes), that are unfortunately screwed into the deck. Though I would prefer them not be screwed, there is no possibility of making them through-bolted, due to the structure/layout of the boat beneath the deck.

Based on I think your recommendation Maine Sail, I use butyl tape whenever the hardware is through-bolted and doesn't need the additional adhesive properties, and I've been using 3M 101 when that's not the case.

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Joz—

So what is the deal with the gap???

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