Join Date: Dec 2002
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good location for seacocks?
I believe she will have a Solid FRG hull, rather than a Cored hull (below waterline).
After drilling out a hole about 1/16"-1/8" larger than the Thru-Hull outer diameter; seal the exposed edges of the hole with unthickened epoxy, allow to set-up (24Hrs), wash amine blush off, then overcoat with thickened epoxy.
Dry-fit the Thru-hull (should be snug).
Prepare & install a backing plate for the inside of the hull.
Install Thru-hull with copius polyurethane sealant (5200 etc).
After drilling hole - gouge out interior core material to a diameter greater than the footprint of the Thru-hull flange. This to carry the compressive load of the fitting nut, and to assure bonding of outer-inner skins through core.
Seal edges - then fill cavity with thickened epoxy.
Continue as above.
If these rudimentary instructions are unclear to you - you''ll probably want some on-site assistance & advice.