Return-Path: Sender: (Marvin Kaye) To: lml Date: Fri, 27 Dec 2002 18:36:40 -0500 Message-ID: X-Original-Return-Path: Received: from [128.102.31.31] (HELO mail.arc.nasa.gov) by logan.com (CommuniGate Pro SMTP 4.0.3) with ESMTP id 1940172 for lml@lancaironline.net; Fri, 27 Dec 2002 10:30:50 -0500 Received: from [143.232.221.83] (reinath.arc.nasa.gov [143.232.221.83]) by mail.arc.nasa.gov (8.9.3/8.9.3) with ESMTP id HAA17437 for ; Fri, 27 Dec 2002 07:30:48 -0800 (PST) Mime-Version: 1.0 X-Sender: mreinath@mail.arc.nasa.gov X-Original-Message-Id: X-Original-Date: Fri, 27 Dec 2002 07:30:47 -0800 X-Original-To: lml@lancaironline.net From: "Mike S. Reinath" Subject: [LML] Re: L320 shroud Content-Type: multipart/alternative; boundary="============_-1171119448==_ma============" --============_-1171119448==_ma============ Content-Type: text/plain; charset="us-ascii" ; format="flowed" Do I have to take special procedures to bond with Hysol or epoxy resin on polyester parts? Just sand off all the gelcoat and prepare as you normally would. I used Hysol and put 2 BID over the joint on the inside and on the outside. Removing all that primer coat represents a lot of sanding ours and a lot of dust. The coat is so deep in the fiber that I have found two situations: or I do not remove all the coat or I will damage the fiber. Both alternatives are not acceptable. Suggestions and ideas, please. I sanded all the gelcoat off my cowl using 36 grit and a disk sander. I have noticed many LNC2s with cracks in the paint on their cowlings. I think it is the gelcoat that cracks when exposed to heat cycling and vibration. I would suggest sanding all the gelcoat off. It is a lot of work, but it's worth it to prevent the cracking. Where you bond, you have to get it all off. Everywhere else, just sand until 90 to 95% of it is gone. Mike Reinath Std. Build 360 N3602M --============_-1171119448==_ma============ Content-Type: text/html; charset="us-ascii" [LML] Re: L320 shroud
Do I have to take special procedures to bond with Hysol or epoxy resin on polyester parts?

Just sand off all the gelcoat and prepare as you normally would. I  used Hysol and put 2 BID over the joint on the inside and on the outside.

Removing all that primer coat represents a lot of sanding ours and a lot of dust. The coat is so deep in the fiber that I have found two situations: or I do not remove all the coat or I will damage the fiber. Both alternatives are not acceptable. Suggestions and ideas, please.

I sanded all the gelcoat off my cowl using 36 grit and a disk sander. I have noticed many LNC2s with cracks in the paint on their cowlings. I think it is the gelcoat that cracks when exposed to heat cycling and vibration. I would suggest sanding all the gelcoat off. It is a lot of work, but it's worth it to prevent the cracking. Where you bond, you have to get it all off. Everywhere else, just sand until 90 to 95% of it is gone.

Mike Reinath
Std. Build 360
N3602M
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