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Internal mast seal


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#1 Black Panther

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Posted 21 August 2019 - 02:10 PM

We have developed a drip of freshwater at the base of the mast when it rains hard. What can i put in the mast to stop it?
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#2 Island Time

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Posted 21 August 2019 - 02:26 PM

Depends. Normally a mast plug can be used just above deck level, and with a drain hole in the side. But then cables must be in a conduit, and sometimes when it rains really hard a little water still gets by. It can be really hard to stop completely. Retro fit with mast in is almost impossible! Maybe a drain in the bottom to the shower or main bilges?


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#3 Black Panther

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Posted 21 August 2019 - 04:35 PM

Right now it is going to the bilge which is a bad thing.
Looks like there is something at deck level as there is a drain hole but it must be dying of old age.i was trying to think of a fax at the lowest halyard exit
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#4 Island Time

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Posted 21 August 2019 - 04:45 PM

If there is an existing seal, then provided all the cables are in a conduit, a SMALL amount of liquid expanding foam can fix it. Just sufficient to put say a 1cm thick layer on the existing one. Bloody hard to remove though...
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#5 Island Time

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Posted 21 August 2019 - 04:46 PM

And you'll need a new drain a little higher up....
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#6 Black Panther

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Posted 21 August 2019 - 06:33 PM

It was bloody heavy rain, is it possible the water backed up to the top of the conduit? Its a small drain, about the size of a big rivet
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#7 Vorpal Blade

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Posted 21 August 2019 - 08:33 PM

Find the lowest halyard or whatever hole in the mast that gives you some access inside. Find a ballon, put it in the mast and inflate, tie off balloon. Get a smooth tipped stick and push it down a bit, try to get it down at least 100mm from the hole you are working through.
Squirt in some foam on top of balloon. If you don't squirt in too much foam it will seal up to the access hole and all will be well with the world, too much and there could be a clean up pending.
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#8 Cazzate

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Posted 21 August 2019 - 08:53 PM

Another take on the above is liquid silicone poured on top of the balloon
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#9 lateral

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Posted 21 August 2019 - 09:30 PM

Another take on the above is liquid silicone poured on top of the balloon

Pourable silicon as in mould making stuff? 

What about foaming epoxy?


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#10 Island Time

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Posted 21 August 2019 - 09:33 PM

So very first thing, make certain that the existing drain hole is clear and not blocked.
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