X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 05 May 2006 08:33:09 -0400 Message-ID: X-Original-Return-Path: Received: from [64.12.137.4] (HELO imo-m23.mail.aol.com) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1093120 for lml@lancaironline.net; Fri, 05 May 2006 08:15:40 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.4; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m23.mx.aol.com (mail_out_v38_r7.5.) id q.40c.eb90bf (3699) for ; Fri, 5 May 2006 08:14:49 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <40c.eb90bf.318c9bb9@aol.com> X-Original-Date: Fri, 5 May 2006 08:14:49 EDT Subject: Re: [LML] WLS primer X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1146831289" X-Mailer: 9.0 Security Edition for Windows sub 5300 X-Spam-Flag: NO -------------------------------1146831289 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 5/5/2006 12:52:04 A.M. Central Standard Time, jskiba@icosa.net writes: Question for all you Paint - Primmer experts. I am planning on Flying initially in WLS primmer before final paint. My question is: When the WLS is sprayed on it is sort of rough or slightly "dimpled" for lack of a better word, but once sanded a little is very very smooth. If you are going to fly in primmer should you NOT sand smooth the WLS but leave the "dimpled" finish, or can one sand the surface smooth and FLY? I guess the real question is: Does sanding WLS open the sealed primmer up or cause other problems for latter on. I hope that makes sense. Jeff, I flew my 320 in smoothly sanded WLS primer (about 320 grit) for over a year. Final paint prep included cleaning and very lightly sanding the primer. The resulting finish has held up (base coat, clear coat) for ten years and 700 flight hours. Problems: 1. The WLS sanded primer coat was very susceptible to creating static in flight. I never got the Loran receiver to work in flight although it worked fine on the ground. Passing my hand along the cowl would cause the hair on my arm to stand up. In other words, some avionics might not work properly whilst flying in WLS primer because of excessive static. 2. The temporary N-number was painted on with Krylon. While it was easily cleaned off with acetone, it left the primer slightly raised, outlining the prior number under the final paint. It took about 6 months before the swelling completely disappeared. 3. Some pin-holes were missed and appeared after the final paint. No more than 15 gathered in about 3 spots on the side of the canopy and cowl. Suggestions: 1. Don't sand the last coat of primer. Leave that for the final paint prep. 2. If the primer is sanded, perhaps apply a final coat of primer after cleaning and before painting. 3. Find a better way to affix the N-number to the primer (decal?). 4. I only made changes to "experiments" that involved the cowl (air in and out), a wing tip and the nose gear door. I should have painted the airplane except for the cowl before flight. Control surfaces and doors can be easily repainted. The cowl can always be painted later. Unless you want to shake out a show plane before painting it or are in a rush to get it in the air, paint most of it before flight testing. The problem are facts and the suggestions are worth their cost - $0.00. Scott Krueger AKA Grayhawk Lancair N92EX IO320 CS Prop Slow Build 1989, Flown 1996 Aurora, IL (KARR) Eschew Obfuscation! -------------------------------1146831289 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 5/5/2006 12:52:04 A.M. Central Standard Time,=20 jskiba@icosa.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Question=20 for all you Paint - Primmer experts.

I am planning on Flying initia= lly=20 in WLS primmer before final paint.

My question is: When the WLS is=20 sprayed on it is sort of rough or slightly
"dimpled" for lack of a bett= er=20 word, but once sanded a little is very very
smooth.

If you are g= oing=20 to fly in primmer should you NOT sand smooth the WLS but
leave the=20 "dimpled" finish, or can one sand the surface smooth and FLY?

I gue= ss=20 the real question is: Does sanding WLS open the sealed primmer up or
ca= use=20 other problems for latter on.

I hope that makes=20 sense.
Jeff,
 
I flew my 320 in smoothly sanded WLS primer (about 320 grit) for o= ver=20 a year.  Final paint prep included cleaning and very lightly sanding th= e=20 primer.  The resulting finish has held up (base coat, clear coat) for t= en=20 years and 700 flight hours.
 
Problems:
 
1. The WLS sanded primer coat was very susceptible to creating static i= n=20 flight.  I never got the Loran receiver to work in flight although it=20 worked fine on the ground.  Passing my hand along the cowl would cause=20= the=20 hair on my arm to stand up.  In other words, some avionics might not wo= rk=20 properly whilst flying in WLS primer because of excessive static.
 
2. The temporary N-number was painted on with Krylon.  While it wa= s=20 easily cleaned off with acetone, it left the primer slightly raised, outlini= ng=20 the prior number under the final paint.  It took about 6 months before=20= the=20 swelling completely disappeared.
 
3. Some pin-holes were missed and appeared after the final paint. = No=20 more than 15 gathered in about 3 spots on the side of the canopy a= nd=20 cowl.
 
Suggestions:
 
1. Don't sand the last coat of primer.  Leave that for the final p= aint=20 prep.
 
2. If the primer is sanded, perhaps apply a final coat of primer after=20 cleaning and before painting.
 
3. Find a better way to affix the N-number to the primer (decal?).
 
4. I only made changes to "experiments" that involved the cowl (air in=20= and=20 out), a wing tip and the nose gear door.  I should have painted the=20 airplane except for the cowl before flight.  Control surfaces and doors= can=20 be easily repainted.  The cowl can always be painted later.  Unles= s=20 you want to shake out a show plane before painting it or are in a rush to ge= t it=20 in the air, paint most of it before flight testing.
 
The problem are facts and the suggestions are worth their cost - $0.00.= =20
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 CS Prop
Slow Build 1989, Flown 1996=20
Aurora, IL (KARR)

Eschew=20 Obfuscation!
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