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West Wight Potter Mailing List maintainer
dfarrell@ridgecrest.ca.us
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Larry,
What you're saying sure does make "common sense", but that's not the way
repairs are typically done, for some reason. If you go hang out in any
boatyard and watch them do repairs (as I have at Svensesn's) or read any
book on fiberglass repair, you'll find they always put the largest layer on
the bottom and lay progressively smaller layers over that (with the
exception of repairing a thru-hull hole, but that's due to the need to bevel
the edge of the repair).
I could speculate as to the reason, but I truly don't know why. However,
it's the time-tested way to do things.
BTW, in case it wasn't clear in my first post, each layer is 1" smaller on
each of the two dimensions, for a 1/2" reduction in size on all edges.
Best,
Judy B, 1985 P19 #266, Redwing, SF Bay, CA
> -----Original Message-----
> From: The Costas [mailto:uffda@sonic.net]
> Sent: Monday, February 14, 2000 3:08 AM
> To: potter mail list
> Subject: Re: Repairing a broken stringer on the P19.
>
>
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> West Wight Potter Mailing List maintainer
> dfarrell@ridgecrest.ca.us
> List hosted by www.tscnet.com
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> Judy
>
> I might not understand completely what you are saying, but I
> found it better
> to start with the smallest (narrowest) layer and end up with the widest.
> That way you only have one exposed edge instead of multiple.
>
> JMHO
>
> Larry
>
>
> >You've got the right idea, but you want to lay down the layers of cloth
> with
> >the widest one at the bottom, with successively narrower ones as you add
> >layers. Each layer should be about 1" narrower than the last.
> The purpose
> >of this is to avoid "hard spots" where the laminate ends; hard spots
> >concentrate all the force along one line, and can cause flexing
> of the hull
> >at the edge of the new glass (causing gelcoat cracks, and possibly, hull
> >cracks too). The final, top (smallest) layer should extend at
> least 2" on
> >either side of the tube (forward and aft) onto the hull, to
> provide enough
> >area for adequate adhesion.
>
>
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