VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > The Never Ending Debate Section > Primers
Register FAQ Members List Calendar Today's Posts

Reply
 
Thread Tools Search this Thread Display Modes
  #51  
Old 10-17-2008, 08:13 AM
w1curtis's Avatar
w1curtis w1curtis is offline
 
Join Date: Jan 2005
Location: Eastern, PA
Posts: 828
Default

Quote:
Originally Posted by RAMPEYBOY View Post
Anyone have an opinion on duplicolor self etching primer? Saw it at Walmart for $4 something a can. Almost looks to be same color as Zinc chromate primer too!
I get it at Autozone but I don't leave it by itself. I go over it with Rustoleum Gloss Protective Enamel. When dry the combination is tough.

http://www.vansairforce.com/communit...t=16336&page=2

__________________
William Curtis
SB RV-10 40237, Status, Panel, Engine, Paint, Me, NE RV-10 Page, Cessna 177RG, AF Missions
?Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.? - Dr. Suess
Reply With Quote
  #52  
Old 05-16-2009, 11:53 PM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,089
Default

I picked up a can of the duplicolor self-etching primer the other day to play around with, so far I'm pretty impressed for rattle-can. I put a light, but full-coverage, coat on a piece of scape angle yesterday. The only prep I did was to wipe the angle off with a rag. Today I took the sharp corner of a bit of poplar I had laying around and rubbed it agross the surface with a significant ammout of force. The paint held up great and the rubbing only polished the surface. Sharp objects like a scribe scratched through pretty easy though. As a plus, the primer sands quite well just like "sandable" primer.

I don't know what kind of corrosion protection this stuff would provide, I looked at the MSDS and there is no mention of zinc chromate or chromium. Looking at paint systems for aircraft, most list zinc chromate as the first component on the MSDS. However, the Duplicolor MSDS is missing about 10% of components (The % by volume/weight only adds up to 90.5%). I guessing that the active solids are part of this missing 10%...
__________________
Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec), but donated early in Sep'19.
Reply With Quote
  #53  
Old 05-17-2009, 07:46 AM
N62XS N62XS is offline
 
Join Date: Jan 2005
Location: Hazlehurst, GA
Posts: 1,359
Default Several methods

On my RV8 I used Alumiprep/Alodine/PPG DP40. Time consuming and a health/environment nightmare. On the RV6A I am using scotchbrite/Marhyde Rattle Can/Cardinal custom mix Grey enamel. Much easier and less of a concern on the health/environment front. On the RV10, some experimentation by using Alumiprep/Alodine/Marhyde Rattle Can on the parts that can be batched in a tub to etch and alodine. The larger parts/surfaces are getting scotchbrite/Marhyde.

An friend of mine in his 70s laughs at us. He was a mechanic with Delta and worked at Piper. His contention is that the Alclad coating will outlast all of us and there are not enough museums to hold these primed airplanes. He may have a point, my 46 Ercoupe does not have any corrosion on it.
__________________

IHN,

2020 Dues Paid

Robby Knox

THEM: Why do you always carry a knife?

ME: I can't open a bag of chips with my Glock!
Reply With Quote
  #54  
Old 05-17-2009, 08:38 AM
SvingenB SvingenB is offline
 
Join Date: Apr 2007
Location: Norway, Stj?rdal
Posts: 598
Default

Quote:
Originally Posted by Hard Knox View Post
An friend of mine in his 70s laughs at us. He was a mechanic with Delta and worked at Piper. His contention is that the Alclad coating will outlast all of us and there are not enough museums to hold these primed airplanes. He may have a point, my 46 Ercoupe does not have any corrosion on it.
He may very well have a point regarding Alclad, but the main issue is the climate. The corrosion rate of aluminum in coastal areas compared with inland areas is typical a factor 100-500. 50 years of operation inland will show the same corrosion as a month or two at the coast.
__________________
RV-4 #4520, Slow built
B Svingen
RV-4 Project Log
Onex Project Log

EAA Chapter 573 Norway
Reply With Quote
  #55  
Old 05-17-2009, 09:16 AM
Webb's Avatar
Webb Webb is offline
 
Join Date: Oct 2007
Location: Jackson, MS
Posts: 1,262
Default

About 4 cases to do all areas inside the plane. I plan to live on the coast one day and went to a more extreme and I mean everything.

If I had to do it over again, I would buy the 2 part primer that you mix from Sherwin Williams which is about the toughest thing I have seen except when I need to prime just one little piece. My friend building a 9A here has used it and his results are stellar.

Something I did learn is if you are planning to top coat a primed area, don't prime it until you are ready spray the top coat. Otherwise, get ready to do a quick sand of the primer if you want good adhession.
__________________
Webb Willmott
Jackson, MS
N32WW
Reply With Quote
  #56  
Old 05-17-2009, 03:45 PM
Andrew M's Avatar
Andrew M Andrew M is offline
 
Join Date: Aug 2006
Location: Secluded Lake,Alaska (AK49)
Posts: 359
Default Two reasons

to prime that I can think of.
As a base for color/ appearance
As protection against elements
Three things needed for corrosion
Moisture, electron flow, and dis-similar metals (or salts on metal)
Remove any one of these three and corrosion won't happen.
Epoxy primers (and others) stop moisture and electron flow, cromate primers provide a sacrificail material to corrode, pure aluminum (clad) turns to aluminum oxide with no pits (same as sandpaper grit, tough stuff).
I like zinc cromate on clean unscuffed clad, epoxy on dis-similar metals and some times packing tape (on nutplates) to prevent electron flow.

Andrew
Reply With Quote
  #57  
Old 05-18-2009, 09:10 PM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,089
Default

Has anyone thought about anodizing the majority of small parts, even wing ribs and bulkheads. You can get a very decent at-home kit for $350. Just a thought....

http://www.caswellplating.com/kits/aluminum.htm
__________________
Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec), but donated early in Sep'19.
Reply With Quote
  #58  
Old 05-18-2009, 09:33 PM
cyberpilot10's Avatar
cyberpilot10 cyberpilot10 is offline
 
Join Date: Feb 2008
Location: Plant City, Florida
Posts: 229
Default Priming

I was a Painter Trainer and Senior Systems Tech Counselor with BASF Chemicals for 7 Years. I can tell you that my 8 emp will be with a rattle can. Shake and spray don't look back, keep pounding rivets...
__________________
cyberpilot10
Plant City, FL
RV 8 Emp.
Reply With Quote
  #59  
Old 05-23-2009, 10:49 AM
okiejohn okiejohn is offline
 
Join Date: Jun 2008
Location: Oklahoma City
Posts: 74
Default Rattle cans on fiberglass

I'm building an RV-12. I self- etch primed aluminum mating surfaces, but not the exterior surfaces.

I fiberglassed my canopy and want to prime for final sanding, seeing what I have, etc., preferably with rattle can lacquer like mar-hyde, etc.

I dont want to screw up the possibility of a conventional 2 part exterior paint job.

At the same time, It looks like people use a 2 part epoxy primer followed by a catalyzed primer surfacer i.e. k36.

Are rattle cans compatible with PPG epoxy?
Reply With Quote
  #60  
Old 06-22-2009, 12:01 AM
Cougar68 Cougar68 is offline
 
Join Date: Nov 2008
Location: Smyrna, TN
Posts: 7
Default

Quote:
Originally Posted by WingsOnWheels View Post
Has anyone thought about anodizing the majority of small parts, even wing ribs and bulkheads. You can get a very decent at-home kit for $350. Just a thought....

http://www.caswellplating.com/kits/aluminum.htm
I seem to remember something in Sport Aviation about how certain kinds of anodizing were the culprit of spar failure.
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 08:41 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.