Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Fri, 01 Oct 2004 11:08:24 -0400 Message-ID: X-Original-Return-Path: Received: from esmtp.cave.com ([66.35.72.5] verified) by logan.com (CommuniGate Pro SMTP 4.2.3) with ESMTP id 439424 for lml@lancaironline.net; Fri, 01 Oct 2004 10:57:24 -0400 Received-SPF: none receiver=logan.com; client-ip=66.35.72.5; envelope-from=lancair@ustek.com Received: from ustek.com ([66.35.73.227]) by esmtp.cave.com (VisNetic.MailServer.v7.2.4.1) with ESMTP id CQN38002 for ; Fri, 01 Oct 2004 10:56:40 -0400 X-Original-Message-ID: <415D702D.40902@ustek.com> X-Original-Date: Fri, 01 Oct 2004 10:56:45 -0400 From: "Robert M. Simon" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: [LML] Re: Legacy missing wing panel, sanders and bond prepping References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------060602000405030309000905" This is a multi-part message in MIME format. --------------060602000405030309000905 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit MikeEasley@aol.com wrote: > I also used liberal amounts of acetone, changed the paper towel very > often. I wet the surface with acetone, and followed up with a fresh, > dry paper towel. > I think I read somewhere about sanding just prior to bonding, > something about exciting the molecules. Studies done at Airlink in Stuart FL (which may not exist since hurricane Jeanne hit!) showed a very consistant decrease in epoxy bonding strength when the composite surfaces were wiped with acetone after sanding. The best adhesion was found using a sequence of acetone wipe, dry sand, dry wipe, and epoxy application. I saw the results 4-5 years ago but the difference was at least a factor of two, and might well have been higher. Robert M. Simon --------------060602000405030309000905 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit MikeEasley@aol.com wrote:

I also used liberal amounts of acetone, changed the paper towel very often. I wet the surface with acetone, and followed up with a fresh, dry paper towel.

I think I read somewhere about sanding just prior to bonding, something about exciting the molecules.

Studies done at Airlink in Stuart FL (which may not exist since hurricane Jeanne hit!) showed a very consistant decrease in epoxy bonding strength when the composite surfaces were wiped with acetone after sanding. The best adhesion was found using a sequence of acetone wipe, dry sand, dry wipe, and epoxy application. I saw the results 4-5 years ago but the difference was at least a factor of two, and might well have been higher.

Robert M. Simon

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