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From: (no name) (no email)
Date: Thu Jan 04 2001 - 22:08:44 EST
In a message dated 12/29/2000 9:56:27 PM Eastern Standard Time,
writes:
> My question is what kind of caulk can I use to seal a chrome-plated bronze
> piece to a thin piece of water-soaked plywood?
My advice is to remove, or raise the metal piece as high as possible, then
clean and dry the mating surfaces as well as you can. Obtain some small
pieces of material 1/8" thick to use as spacers between the metal piece and
the tank. I use inch and a half lengths of 1/8" wire bent into an L shape
for easy removal. Mask around the metal piece and mask around where the
metal piece goes on the tank for easy cleanup. Tape down four of the wires
so that about 1/4" of the wire is in between where the metal piece mates with
the tank equidistant around the tape circle. Squirt 5200 or Silicon Rubber
in the space between the metal piece and the tank. Bring the metal piece
down until it is resting on the wires and hold in place with the original
fasteners. Have a beer.
The next day cut with a knife around the metal piece and remove most of the
tape and excess bedding material *but leave the wire spacers in place*.
After the bedding has cured enough so that it will not ooze out from between
the metal piece and the tank top when you remove the wires you can remove the
wires. If you tighten the fasteners a tiny bit sometimes uncured bedding
inside will ooze a little and fill the wire holes. After the bedding has
cured most of the way to its final firmness you can take up a bit on the
fasteners and put the bedding under compression.
If done right you have made a perfect gasket between the tank and the metal
piece. When it is fully cured you can put this gasket under compression and
it will NOT leak, even though the plywood remains wet as this technique does
not rely on the adhesiveness of the caulking to seal the joint.
The above may seem complicated, but on a boat you pay now or you pay later,
and paying later is usually more expensive, especially when it involves fresh
water damage.
Norm
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