I used to have a small crack ( about 4 inches ) along the aft part of the
hull-keel joint . Every spring I grinded it a little, filled with epoxy/silica
. Every layup the crack showed up again.
2 years ago I replaced the standard West System epoxy with their g/Flex
product, mixed with silica . No more cracks. This epoxy is flexible ( you can
glue poly kayaks, even wet material with it ). I prefer to use that instead of
5200 because it is still "compatible" with gelcoat/epoxy in case I need to redo
it again.
Sylvain
C&C27 MkIII
________________________________
From: Tortuga via CnC-List <cnc-list@cnc-list.com>
To: cnc-list@cnc-list.com
Sent: Friday, May 2, 2014 2:22 PM
Subject: Re: Stus-List Keel Fairing
"For minor fairing you can use AwlFair or 3M Premium Filler. For deeper spots
start with 3M High Strength Filler then smooth with the lighter fillers."
I also have some cracking on the trailing edges near the keel/hull joint. I'm
thinking I should dig it out and re-fair it. I was reading a blog in which the
author recommended using 3M 5200 for its flexibility. Below is a quote from the
blog. I'm soliciting opinions here.
Thanks Dennis and Wally
Derek
Tortuga, 30/1
Ballantyne's Cove, NS
"The first thing to do if you're going to fix this clean up both the joint and
the surrounding area, about an inch to each side of the joint. Clean it down to
the fiberglass or gelcoat. Make sure it's all dry and clean.
Next, run a piece of blue painter's masking tape about 1/2" to 1" parallel to
and on either side of the joint. Get a pack of inexpensive sqeegees. Evercoat
makes a three pack. They're flexible and cheap. Good thing, because they're one
use.
Finally, with a caulking tube of 3M 5200 or 4200 in the color of your choice (I
use black), put a bead all along one side of the joint in the keel. Don't be
afraid to use more than you need. With the squeegee spread the 5200 evenly and
smoothly from front to back. The bead should be spread evenly between the tape
filling to the thickness of the tape."
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