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post #1 of 11 Old 02-15-2009 Thread Starter
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best pipe dope?

Anybody have any praise or condemnation about pipe thread sealant brands? Specifically Im thinking of seacock ballvalve to adapter flange or barbed adapter threads. Tapered pipe thread to tapered pipe thread.
Are there some specifically for seawater? Or does one use something like 4200 or 291 instead like I anticipate using on the thru hull threads?
Ive got some Hercules "BLOCK" but all makers seems to say their stuff is a miracle.
Teflon tape seems inadequate.
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post #2 of 11 Old 02-15-2009
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I used..

many years ago I used to be a rep for Hercules Chemical among other lines. My favorite dope is Real-Tuff but some guys liked Megaloc too. Rectorseal is also popular but it is a petro based dope as opposed to Teflon and as such should not be sued on plastic threads.

One trick many pipe fitters use and employ is to wrap the fitting with Teflon tape then apply the pipe dope. The quality of thread cuts is fairly poor these days so the combo of tape and dope works well. If you want to use one or the other definitely use dope over tape..

Tape:

Tape W/Dope:

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post #3 of 11 Old 02-15-2009 Thread Starter
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thanks as always Maine Sail
Ill save my BLOCK for home
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post #4 of 11 Old 02-15-2009
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Maine
thanks for that, getting ready to put in 2 thruhulls as soon at it warms up.
What is your opinion about 4200 and temp?
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post #5 of 11 Old 02-15-2009
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Maine
thanks for that, getting ready to put in 2 thruhulls as soon at it warms up.
What is your opinion about 4200 and temp?

I'd wait till it gets and stays above freezing even at night. Working in cold climes is tough...

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post #6 of 11 Old 02-15-2009
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I'd wait till it gets and stays above freezing even at night. Working in cold climes is tough...
I've been working on the boat in the cold all winter except when it got REAL cold.

I'm concerned about the temp the caulk can take during setup time?
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post #7 of 11 Old 02-15-2009
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Timely topic, I never would have thought to use paste over tape, or both tape/paste.

Thanks MS

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post #8 of 11 Old 02-15-2009
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The Loctite brand of dope seems to work well in the cold in that it can still be spread on the threads.

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post #9 of 11 Old 02-15-2009
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The big thing to look out for is a REAL UL approval on the Teflon tape

A LOT of tape sold is knock-off garbage

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post #10 of 11 Old 02-15-2009
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"I'm concerned about the temp the caulk can take during setup time?"
If that's not printed on the rube, 3M's toll-free number should be. Those folks are absolute aces, call any of their toll-free numbers wit any question about any product they make--and they'll connect you to someone who can answer it, often an engineer.
We were trying to track down their "silver" masking tape, which is designed to peel clean after extended exposure to sunlight (up to 30 days, as opposed to a week for blue/green premium tapes) and got bounced through 3M divisions all the way to AUSTRALIA which is where the division that makes it apparently happens to be. Found the local supplier, confirmed the huge difference in working time, bought the tape. Two days of masking, working the week, rain the next weekend...yes, it WAS on for more than a week, and came off clean.
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