Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Wed, 13 Oct 2004 09:59:35 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 471669 for lml@lancaironline.net; Wed, 13 Oct 2004 08:49:04 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=MikeEasley@aol.com Received: from MikeEasley@aol.com by imo-m25.mx.aol.com (mail_out_v37_r3.8.) id q.e0.33c4e22 (4410) for ; Wed, 13 Oct 2004 08:48:20 -0400 (EDT) From: MikeEasley@aol.com X-Original-Message-ID: X-Original-Date: Wed, 13 Oct 2004 08:48:20 EDT Subject: Re: [LML] Re: Making a Mold X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1097671700" X-Mailer: 9.0 for Windows sub 5113 -------------------------------1097671700 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Dan, My problem seems to be porosity in the mold, more than the wax not releasing. Bondo, or any other polyester fillers seem to be porous. When I rub the wax on the Bondo, it turns darker, indicating that it's "soaking in". The epoxy seems to find its way through the wax and into the filler. I made a seat pan yesterday; two BID, with 3M Lightweight Filler, and Maquires, and it ripped most of the Bondo off the mold. The mold is repairable, and I can sand the excess stuff off the part. I'll repair the mold and apply some polyester primer/surfacer to seal it before I do another layup. I think the idea of sanding and getting a glossy surface before applying the wax is key. The epoxy can't stick to really slick surfaces like packing tape. I checked the Internet for "Chemlease". At www.compositesworld.com they list no less than 40 companies that make mold releases! Where can I buy Chemlease in something less than a 55 gallon drum? I'll check some of the links. Mike -------------------------------1097671700 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Dan,

My problem seems to be porosity in the mold, more than the wax not rele= asing. Bondo, or any other polyester fillers seem to be porous. =20= When I rub the wax on the Bondo, it turns darker, indicating that it's "soak= ing in". The epoxy seems to find its way through the wax and into the=20= filler. I made a seat pan yesterday; two BID, with 3M Lightweight Fill= er, and Maquires, and it ripped most of the Bondo off the mold. The mo= ld is repairable, and I can sand the excess stuff off the part.

I'll repair the mold and apply some polyester primer/surfacer to seal i= t before I do another layup. I think the idea of sanding and getting a= glossy surface before applying the wax is key. The epoxy can't stick=20= to really slick surfaces like packing tape.

I checked the Internet for "Chemlease". At www.compositesworld.com they list no less than 40 c= ompanies that make mold releases! Where can I buy Chemlease in somethi= ng less than a 55 gallon drum? I'll check some of the links.

Mike

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