Michel
Joined: 10 Jan 2006
Posts: 966
Location: Norway
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 Posted: Mon Mar 13, 2006 6:52 am Post subject: SV: Re: Wing Tips |
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| Quote: | From: Richard Rabbers [rira1950(at)yahoo.com]
I had the understanding that epoxy can be applied over polyester but not the
opposite. ('can' might not be the right word to use here..)
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It is true, Richard, that many polyester and fiberglass yacht's hull are covered with epoxy, under the waterline, to prevent ozmose and small blisters. But, apart from thermo-plastic, I believe epoxy will bound on anything. After all, epoxy glue such as Araldit, is the most commonly used glue.
In the case of my cowling, I have cut it about half way, then extendend both lower and upper part, forward, by using epoxy and fiberglass. The end of the old polyester part was, of course, tapered, and the new layers were applied with an overlapping, as one would do for any fiberglass repairs. Then, I had to cut a part of the underside of the cowling, to accomodate for a scoop for my new air-cooled engine. Since it came exactly at the overlapping region, I had in my hand a piece of material from both resins. And I tried to bend it for destruction, to see if it would delaminate along the bonding seam. It did not. With enough pressure, the piece of material broke in two, as if it was of the same nature all the way through.
Of course, before bounding the new and old material, surfaces have to be clean and sanded down. Especially a cowling, where oil and sooth has deposited for years.
Cheers,
Michel
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