X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 28 Jul 2012 16:46:35 -0400 Message-ID: X-Original-Return-Path: Received: from mail-pb0-f52.google.com ([209.85.160.52] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTPS id 5682463 for lml@lancaironline.net; Sat, 28 Jul 2012 16:42:13 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.160.52; envelope-from=pjdmiller@gmail.com Received: by pbbro8 with SMTP id ro8so7118216pbb.25 for ; Sat, 28 Jul 2012 13:41:36 -0700 (PDT) Received: by 10.66.74.97 with SMTP id s1mr14319357pav.11.1343508096077; Sat, 28 Jul 2012 13:41:36 -0700 (PDT) X-Original-Return-Path: Received: from [192.168.15.2] (S01060017ee00b6c0.cg.shawcable.net. [174.0.115.173]) by mx.google.com with ESMTPS id wh7sm918443pbc.33.2012.07.28.13.41.34 (version=TLSv1/SSLv3 cipher=OTHER); Sat, 28 Jul 2012 13:41:35 -0700 (PDT) From: Paul Miller Content-Type: multipart/alternative; boundary="Apple-Mail=_79E9F98F-9809-4616-81C2-980B40C04FEB" X-Original-Message-Id: <24E3AD86-36C3-45AB-B982-751D9C1517C7@gmail.com> Mime-Version: 1.0 (Mac OS X Mail 6.0 \(1485\)) Subject: Re: [LML] ppg paint X-Original-Date: Sat, 28 Jul 2012 14:41:19 -0600 References: X-Original-To: "Lancair Mailing List" In-Reply-To: X-Mailer: Apple Mail (2.1485) --Apple-Mail=_79E9F98F-9809-4616-81C2-980B40C04FEB Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii You are treading into the land of voodoo and witchcraft talking about = static charges and dissipation. A big factor is where you fly and how = much precip because you may not notice a difference until you get into = specific conditions and then you can lose radios and other avionics = depending on where the antenna for each piece is located. Otherwise, = fair weather flying may not make any difference in my experience. I don't know if a "composite" aircraft can transmit a charge from the = paint surface to the static wick because of the bonds and glues and so = forth so I wouldn't depend on carbon components alone to provide the = necessary dissipation without expert guidance or getting the plane = mapped for static by an avionics shop (few hundred bucks I recall). = The purpose of the PPG coating is to take that charge from the paint = surface to the exit point on the wick which also includes paths through = bonding straps from the airframe to the ailerons, for example. = Otherwise, you can get pinholes in the paint, arcing between components = and more. The leading edges, tips, antennae, cowls all get hit pretty = hard in dry air, precip, snow. Each external antenna will have a = anti-static coating already applied which is why it will be marked "do = not paint". The frontal surfaces of the airplane are the major areas of = buildup and concern so just look where the precip will hit the airframe = and that's where the static will source from. I don't know how much extra work the coating would be and I don't know = if it would be worth the weight, cost, time. It probably is a tradeoff = with your expected flying conditions which, if like my Legacy, may be = 95% VFR even on my cross countries from Florida to Calgary. However, = dry snow, low relative humidity, fast speeds, virga could be a problem = and I lose radios once or twice a year in precip. I went through some rain on my last trip and peeled off most of the = leading edge coats of clear and some of the topcoat down to the = composite. Imron was the paint. Makes the pinholes from static a minor = problem in comparison so the choice of paint and protection of the = leading edge may well be more important in the long run. Paul Legacy Calgary On 2012-07-28, at 10:03 AM, Tom Wallace wrote: > I am trying to finalize my selection of paint systems and think I have = selected PPG as the vendor as they have been very helpful thus far. = However I am trying to decide if I use their Aerospace for General = Aviation products CA 8620 primer and CA 8000 or CA 8800 topcoat product. > =20 > I have seen a beautiful paint job on an ES using PPG automotive paint = system (K36 primer DBC basecoat with DCU 2002 clear coat). So if anyone = has experience with these paint systems your input would be greatly = appreciated. > =20 > Lastly, PPG makes an antistatic Coating 528x310 that is conductive = that they recommend over a composite surface first. If anyone could = share their thoughts on use of this over the entire surface or just in = selective areas it would also be appreciated. > =20 > =20 > Blue Skies, >=20 > Tom > =20 --Apple-Mail=_79E9F98F-9809-4616-81C2-980B40C04FEB Content-Type: multipart/related; type="text/html"; boundary="Apple-Mail=_B5206CFB-0080-4715-9DBB-13AB95C318AC" --Apple-Mail=_B5206CFB-0080-4715-9DBB-13AB95C318AC Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii You = are treading into the land of voodoo and witchcraft talking about static = charges and dissipation.  A big factor is where you fly and how = much precip because you may not notice a difference until you get into = specific conditions and then you can lose radios and other avionics = depending on where the antenna for each piece is located. =  Otherwise, fair weather flying may not make any difference in my = experience.

I don't know if a "composite" aircraft = can transmit a charge from the paint surface to the static wick because = of the bonds and glues and so forth so I wouldn't depend on carbon = components alone to provide the necessary dissipation without expert = guidance or getting the plane mapped for static by an avionics shop (few = hundred bucks I recall).   The purpose of the PPG coating is to = take that charge from the paint surface to the exit point on the wick = which also includes paths through bonding straps from the airframe to = the ailerons, for example.  Otherwise, you can get pinholes in the = paint, arcing between components and more.  The leading edges, = tips, antennae, cowls all get hit pretty hard in dry air, precip, snow. =   Each external antenna will have a anti-static coating already = applied which is why it will be marked "do not paint".  The frontal = surfaces of the airplane are the major areas of buildup and concern so = just look where the precip will hit the airframe and that's where the = static will source from.

I don't know how much = extra work the coating would be and I don't know if it would be worth = the weight, cost, time.  It probably is a tradeoff with your = expected flying conditions which, if like my Legacy, may be 95% VFR even = on my cross countries from Florida to Calgary.  However, dry snow, = low relative humidity, fast speeds, virga could be a problem and I lose = radios once or twice a year in precip.

I went = through some rain on my last trip and peeled off most of the leading = edge coats of clear and some of the topcoat down to the composite. =  Imron was the paint.  Makes the pinholes from static a minor = problem in comparison so the choice of paint and protection of the = leading edge may well be more important in the long = run.

Paul
Legacy
Calgary


On 2012-07-28, at 10:03 AM, Tom = Wallace <tlwcfii@yahoo.com>= wrote:

I am trying to finalize my selection of paint = systems and think I have selected PPG as the vendor as they have been = very helpful thus far.  However I am trying to decide if I use = their Aerospace for General Aviation products CA 8620 primer and CA 8000 = or CA 8800 topcoat product.
I have seen a = beautiful paint job on an ES using PPG automotive paint system (K36 = primer DBC basecoat with DCU 2002 clear coat).  So if anyone has = experience with these paint systems your input would be greatly = appreciated.
Lastly, PPG makes = an antistatic Coating 528x310 that is conductive that they recommend = over a composite surface first.  If anyone could share their = thoughts on use of this over the entire surface or just in selective = areas it would also be appreciated.
Blue = Skies,
3D"Description:
Tom
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