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04-29-2011, 10:30 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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Quote:
Originally Posted by danielhv
Does anything truly DRY in HOUSTON? 
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Never!
I just scuff anything internal with Scotchbrite and hit it with Duplicolor self-etch. Exterior stuff? The painter takes care of that....
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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04-29-2011, 01:24 PM
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Join Date: Apr 2008
Location: broussard louisiana
Posts: 155
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+1 for duplicolor.... Tough as nails!!
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Ben Bell
RV8 (sold)
Awaiting Kitfox SS7 kit
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04-30-2011, 06:55 AM
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Join Date: Oct 2010
Location: Berwick, Nova Scotia, Canada
Posts: 83
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Mr Dye,
Do you clean the scuffed parts after you have scuffed them or do you go right from scuffing to using Duplicolor primer? I just bought 2 cans of Duplicolor (all they had left) but haven't used any yet. It;s on sale right now 2 for 1  Think I'll buy a case of it!
Cheers
Chris
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04-30-2011, 08:04 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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Quote:
Originally Posted by CDBridgesRV7A
Mr Dye,
Do you clean the scuffed parts after you have scuffed them or do you go right from scuffing to using Duplicolor primer? I just bought 2 cans of Duplicolor (all they had left) but haven't used any yet. It;s on sale right now 2 for 1  Think I'll buy a case of it!
Cheers
Chris
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If I felt that it had grease, oil, wax, adhesive, or something else that migt be chemical in nature, I'll clean it with whatever seems appropriate. For clean material, I just wipe off th edust from scuffing and shoot.
Paul
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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04-30-2011, 12:10 PM
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Join Date: Jan 2010
Location: Tyler, Texas
Posts: 350
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Turns out Dupli-Color is made by SHERWIN-WILLIAMS CO
https://partimages.genpt.com/partimages/684954.pdf
I also clean scuff everything, wash with Dawn and Spray Can Self Etch
__________________
RV 7
391RK Reserved
IO360 9:5:1 AFP
Slow Build
Last 90%
Tyler, Texas
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05-02-2011, 03:13 PM
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Join Date: Jan 2007
Location: Mount Vernon, IN
Posts: 1,270
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The photo of Jim Wright on his hands and knees made me think of this.
A very handy way to scuff larger areas, say if you're painting your own skins, etc. is to put the scotchbrite pad in an orbital sander and just go at it.
You can even put a coarse piece of sandpaper in the sander, or just leave in whatever is in it, place the scotchbrite between the orbital sander and the aluminum and go at it. The sandpaper typically holds the scotchbrite just fine.
No, the scotchbrite isn't going to hurt the alclad... but water, sweat, and corrosion will!!! Much better to have GOOD paint adhesion than not.... aluminum is hard enough to bond to so scotchbrite is a definite help.
Then clean and paint with your choice of paint system.
__________________
Vince Frazier
www.f1aircraft.com
F1 Rocket and F4 Raider components
1-888-F1AIRCRAFT (1-888-312-4727)
www.flyboyaccessories.com
RV and Rocket Accessories, Tailwheels, Tools, & More
1-888-8FLYBOY (1-888-835-9269)
F4 Raider - under construction
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RV-4 "Chief Pontiac" - sold in 1994, purchased in 2018
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05-02-2011, 06:46 PM
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Join Date: May 2008
Location: KANE, Hugo, Minnesota
Posts: 765
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I do not scuff before priming with a self-etching primer. I went back and forth with this but ultimately the self-etching primer I use (Napa 7220) is not a real solid barrier against moisture unless it is sealed with paint. So I figured (my figuring is not academically related...just putting together the info I have and arriving at a conclusion) that the alclad would be an additional barrier in preventing corrosion and decided to leave it as it is. The self-etching primer, if sprayed and allowed to set (for a week) should etch the surface for a "good enough" bond. Since the primer is not a moisture barrier the alclad is still underneath to provide an added measure of protection.
I have scuffed scrap pieces of aluminum and taken non-scuffed alclad aluminum and sprayed them. To me, the bond durability seems to be about the same.
Not trying to start a war...these are my experiences and my thoughts and the process I used.
__________________
Aaron Arvig
RV-9A
Empennage Done
Wings-In Progress
N568AK Reserved
SOLD?but I'll be back
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05-03-2011, 06:16 PM
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Join Date: Sep 2010
Location: Seattle, WA
Posts: 120
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I second Aaron. I have tried spraying DuplicColor self etching primer on scuffed and non-scuffed alclad sheet, if allowing it to cue for a couple of days, the bonding on them seems the same. A finger nail won't be able scratch to through the primer on both of them, just leave a mark. And an unburred sheet aluminum will scratch through both of them. So, I just clean and spray without scuffing the parts covered with blue plastic. For ribs, I will scuff them all before cleaning and spraying because they came uncovered and there normally are some scratches to be smoothed anyway.
Shawn
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05-03-2011, 08:47 PM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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I appreciate
everyone's input. My reason for asking was related to the alclad layer. I know it's VERY thin, and I know it's possible to scuff off or through. I also have to believe that paint adhesion to a scuffed surface will be better. So far I have just cleaned and primed with NAPA 7220.
I would be great to hear from someone who has some real expertise in all this
To scuff or not to scuff... that is the question.
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05-03-2011, 09:49 PM
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Join Date: Aug 2006
Location: Texas
Posts: 85
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I just wash with simple green aviation cleaner that's made for aluminum, then rinse, followed by air dry. I then hit it with Sherwin Williams 988 without scuffing the part up. It seems to make no difference whether or not the part was scuffed up prior to priming. The final product produces the same results. So, I don't scuff to save a little time. YMMV
Cheers
__________________
Kobwo
Having to get out of the building business
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