Fellow forum members, I come to you with hat in hand humbly requesting advice
on properly sealing around the thru hull
studs for my zinc anodes. When we bought the boat
several years ago the studs had some kind of waxy putty smeared around them on the inside and outside of the hull
penetration, including over the nuts and washers.
That putty seemed to be getting dried out and flaky, so three years ago during the annual haul out
I had the yard pull the studs and reseal them. It looked like they used 4200 or some other similar sealant
in the hole around the studs and then threaded the nut and washer down on top of the sealant
. There was just a small amount of sealant squishing out from around the washers. This looked much cleaner than the old wax putty and seemed to work
well at the time.
Last year we did a short haul to pressure wash the hull
and change zincs. After the haul out
I had a slow leak around one of the zinc studs. We just lived with it through the season and boat
has been on the hard
since last Fall. Now I'm getting her ready to go back in the water
and need to address this. The sealant looked better but only lasted a couple years. I'm not even sure what the wax stuff was, but it was probably 10 years old at least when I replaced it and had never let a drop of water
pass. What is the proper way to seal these things and why don't I just epoxy
them in place so I don't have to worry about it any more? I assume they don't do that because it would make it a bear to get them out, but these studs seem pretty durable. Not sure they would need to be replaced again in my lifetime. What say ye all?