Tom:
Yes, there is a way to do that -- put a releasing agent on the backing
plates before tightening down. They will come off much easier after the
mixture cures. That said, if you squeeze the mixture out around the plates
and let it cure, it's not likely to leak anyway. You could always go back
later and apply 4200 if you felt the need.
My first boat was a Ranger 26 with an IOR-style keel that a prior owner
had installed. We noticed that the bilge would periodically fill with
water, and at first we could not find the source. When we removed the keel
nuts and flimsy backing plates, we discovered cracks around several of the
bolt holes. To address it, I bought a large stainless plate to go over all
the keel bolts, and we laid the plate over the bolts onto a mixture of West
System and colloidal silica, then tightened the bolts until the mixture
squeezed out around the plate. When we finished, it was incredibly strong
and did not leak a drop -- without any additional sealant.
I'm not suggesting that you over-engineer re-bedding your backing
plates, but the microballoon mixture will likely do the trick without
additional sealant.
Matt
-----Original Message-----
From: Thomas Delaney via CnC-List
Sent: Wednesday, February 06, 2019 12:22 PM
To: cnc-list@cnc-list.com
Cc: Thomas Delaney
Subject: Re: Stus-List Prepping for 35-1 Keel Bolts/Smile Fix
Hi Matthew,
I love the idea of having a more structurally sound bedding material
for the backing plates. This is probably a stupid question - would the
microballoon mixture be a replacement for the 4200? Or is there a way
to bed the plates with the microballoon mixture, get the them back up
again without ruining the new surface, and bed again with a layer of
4200?
Thanks,
Tom
On Wed, Feb 6, 2019 at 12:00 PM <cnc-list-requ...@cnc-list.com> wrote:
---------- Forwarded message ----------
From: "Matthew L. Wolford" <wolf...@erie.net>
To: <cnc-list@cnc-list.com>
Cc:
Bcc:
Date: Wed, 6 Feb 2019 11:12:40 -0500
Subject: Re: Stus-List Prepping for 35-1 Keel Bolts/Smile Fix
Instead of merely using 4200 to bed the backing plates, you may want to
consider first bedding them in a microballoon mixture (like West System
with colloidal silica). This will eliminate high spots and spread the
load on the backing plates more evenly.
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