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From: Arild Jensen (no email)
Date: Tue Oct 02 2001 - 21:31:59 EDT
At 10:50 AM 10/03/2001 -0400, Gene Gruender wrote:
>I'm in the process of painting my boom. With the outrageous cost of
>Awlgrip, I don't want corrosion to start again any time soon. It'll be
>paianted by tonight and I'll be bolting hardware back on by the weekend.
>
>I'm looking for suggestions of what to put on the screws and under the
>plates to stop it.
REPLY
I have seen the white stuff sold at WEST Marine stores. Can't recall the
name at the moment.
It is basically a silicone in some sort of grease that doesn't evaporate.
Carver boats all come from the factory with several tubes of the stuff for
use when assembling the aluminum arch and SS rails etc.
And yes it does work!
Corrosion Block makes similar claims for their product. More likely sold
at commercial chandleries.
I picked mine up at Seattle Fish EXpo.
Raytheon suppllies a dark blue thick liquid for use with their aluminum
housings on GPS and Radar equipment. where stainless steel fasteners and
mounting hardware contacts the aluminum.
Basically any substance which coats the metals and prevent direct contact
of the two dissimilar metals is effective.
The substance has to withstand washing away by salt water, rain and
normal weathering effects.
For a gasket under SS fittings use a sheet of 10 mil mylar or some other
thick plastic.
This acts like a dielectric barrier and stops galvanic action between
aluminum and SS.
I would also caulk the edges so water cannot get in. This will stop
crevice corrosion from starting in the SS.
Crevice corrosion on stainless steel begins anytime you have still water
sitting next to the SS surface.
Blocking out the oxygen is what starts the corrosion.
Cheers
Arild
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