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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 05-08-2009
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3M 4200 or 101

I have read several differing opinions of bedding thru-hull fittings. Should I use 3M 4200 or a polysulfide like 3M 101?
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Old 05-08-2009
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Either would work. What kind of thru-hull fitting are you putting in.
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Quote:
Originally Posted by sailingdog View Post
Either would work. What kind of thru-hull fitting are you putting in.
It is a bronze thru-hull which is the outlet for the sink drain. There is a backing plate that is glassed to the inside of the hull at the penetration.
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For what? The depth or speed transducers??? Either should work as the through-hull is Marelon...

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If you have a solid mechanical connection, consider using 101. 101 is a sealant, 4200 is an adhesive. If you need to get it apart in the future it will be easier to do if you use 101. If you want a little extra security, the 4200 will add an adhesive component that might help prevent it from coming loose.
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Quote:
Originally Posted by donhaller View Post
I have read several differing opinions of bedding thru-hull fittings. Should I use 3M 4200 or a polysulfide like 3M 101?
This is entirely dependent upon your choice of seacock installation. Are you using a true & proper flanged seacock with through bolts that hold the flange to the hull or are you using a ball valve simply threaded onto a thru-hull fitting directly?

If you are threading a ball valve directly to a thru-hull you really have NO mechanical seal strength and might even opt for 5200. I hate 5200 but I dislike ball valves threaded directly to a thru-hull even more..

So it all depends on whet your definition of "seacock" is. With proper flanged seacocks that are bolted to the hull 101 is great stuff as is Sikaflex 291. Sika 291 is a lower adhesion polyurethane 220 PSI vs. 300 PSI for 4200 vs. 700 PSI for 5200. 3M 101 is about 140 PSI..
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One reason to use 4200 is cure time. 4200 cures in a 24-48 hours... 101 takes two to three weeks to cure.
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Can the boat be splashed before the 2-3 week cure time?
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Old 05-09-2009
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as long as we're into it...where does 4000 fit in to the product line?
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