Thanks Chuck,
The problem is that in the old hole, there is 5200 in place of balsa core. I
would have to remove the 5200 and replace with epoxy filling. I don’t know how
far 5200 goes until I actually start removing it. I don’t feel very good
about filling epoxy over 5200.
My preference would be to just re-fill with 5200 to fill a void which is 40mils
all around the grocco thrugh-hull.
From: Chuck S [mailto:cscheaf...@comcast.net]
Sent: Thursday, May 08, 2014 7:48 PM
To: Petar Horvatic; CNC boat owners, cnc-list
Subject: Re: Stus-List Through-hull hole size
You don't need to bevel. Just use the groco as a mold. Wax it so epoxy
doesn't stick to it. Rough up the old hole with 80 grit paper, acetone wipe,
then fit the groco into the hole so you can pour in a filler, maybe use string
to hold it in place, then mix up an epoxy filler such as West and 404 high
density. Keeping the Groco how you want it, and secure, pour in the filler.
Let it harden a day. Then remove the groco by unscrewing it. Check there are
no voids in the filler, and clean off the amine blush with a 3M pad and install
the groco w 4200 or whatever you use.
Option B is to place a sheet of plastic sheeting over the hole from underneath
and brace it against the outside of the boat with a boat cushion and fill the
hole from inside. Let it harden and then drill a new hole with a hole saw.
Chuck
Resolute
1990 C&C 34R
Atlantic City, NJ
_____
From: "CNC boat owners, cnc-list" <cnc-list@cnc-list.com>
To: "CNC boat owners, cnc-list" <cnc-list@cnc-list.com>
Sent: Thursday, May 8, 2014 11:43:01 AM
Subject: Stus-List Through-hull hole size
I took out the old Datamarine Sandpiper transducer that was installed with a
hole size of 2-1/16". My intention is to put a grocco 1-1/2" scoop strainer.
OD for this fitting is 1.9". Does anyone know or has experience with this
decision? Is 2-1/16" close enough to be called slightly larger than 1.9" or
is the hole size too big and I need to grind out a hole to a 12:1 bevel,
then glass it, fill with epoxy and drill a new hole?
Petar Horvatic
Sundowner
76 C&C 38MkII
Newport, RI
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