Our 1978 Trillium
4500 developed a water leak into the cabinet below the sink on our last outing. The primary source of the leak was worn O-rings around the hand pump, which was a simple replacement of the two O-rings.
The secondary, and more problematic problem was that water was flowing under the rim of the stainless sink and into the molded fiberglass
cabinet below. When I pulled the sink I was surprised that there was no sealant putty or tape between the sink rim and the fiberglass
countertop. The 3/4 inch plywood underlying the fiberglass
countertop had minimal water damage, but had sagged about 1/4 inch across the back span of the cutout, so I fashioned a support to bring it up level.
Has anyone else seen this lack of setting seal when pulling their sink from a molded fiberglass cabinet?
When I reset the sink, what should I use to reseal the sink? I have butyl tape, so I'm tempted to use as I already have it and its flexibility, adhesiveness, and resistance to drying seem to be advantageous.