Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Thu, 08 Jul 2004 09:25:26 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 4.2b7) with ESMTP id 250055 for lml@lancaironline.net; Thu, 08 Jul 2004 02:25:21 -0400 Received: from Newlan2dl@aol.com by imo-m23.mx.aol.com (mail_out_v37_r2.6.) id q.1a6.25eb4a0c (4380) for ; Thu, 8 Jul 2004 02:24:44 -0400 (EDT) From: Newlan2dl@aol.com X-Original-Message-ID: <1a6.25eb4a0c.2e1e42ac@aol.com> X-Original-Date: Thu, 8 Jul 2004 02:24:44 EDT Subject: Wheel Wells, etc, why are builders using primers? X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1089267884" X-Mailer: 9.0 for Windows sub 5032 -------------------------------1089267884 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I keep reading about people using primers for exposed parts like the wheel wells. Primers are by definition very porous. They are designed to absorb surface coatings and have a high surface energy (which is the opposite of waxing with low surface energies) as a way of promoting bonding. In addition, the epoxy backbone is sensitive to UV light and has the bonds broken at that frequency and energy, (acrylic polymers are not very sensitive to UV frequency and thus are long lasting in sun). Why not use a urethane? It will not stain or discolor as easily as epoxy based primers. True, the primers tend not to run as easily and are easier to apply than a gloss. And a gloss will not hide flaws very well but I'm sure all of the work out there is flawless! So why use a primer? What am I missing? Dan Newland -------------------------------1089267884 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

I keep reading about people using primers for exposed parts like the wh= eel wells. Primers are by definition very porous. They are= designed to absorb surface coatings and have a high surface energy (wh= ich is the opposite of waxing with low surface energies) as a way of promoti= ng bonding. In addition, the epoxy backbone is sensitive to UV light a= nd has the bonds broken at that frequency and energy, (acrylic polymers are=20= not very sensitive to UV frequency and thus are long lasting in sun).&n= bsp; Why not use a urethane? It will not stain or discolor as easily a= s epoxy based primers. True, the primers tend not to run as easily and= are easier to apply than a gloss. And a gloss will not hide flaws ver= y well but I'm sure all of the work out there is flawless!

So why use a primer? What am I missing?

Dan Newland

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