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10-21-2010, 08:09 AM
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Join Date: Jan 2005
Location: Tulsa, OK
Posts: 1,015
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Quick paint prep question
Prepping my -7 for paint this winter and going with the PPG Concept paint with K36 high build primer. I am using the raw epoxy approach for pinholes on the cowling prior to the primer application but wondered what I need to do on the gel coated wing an tail tip parts. Do I need to sand and epoxy coat and then prime or just sand and roll/shoot the K36 primer. 
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10-21-2010, 09:01 AM
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Banned
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Join Date: Jul 2006
Location: Giddings Municipal Airport (KGYB)
Posts: 196
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definitely sand it first.
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10-21-2010, 09:32 AM
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Join Date: Jan 2005
Location: SoCal
Posts: 2,061
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Clean thoroughly before sanding (and after). There is probably release wax on the gelcoat and sanding will just drive it in. Ask how I know.
__________________
Steve Zicree
Fullerton, Ca. w/beautiful 2.5 year old son 
RV-4 99% built  and sold 
Rag and tube project well under way
paid =VAF= dues through June 2013
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10-21-2010, 09:45 AM
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Join Date: Jun 2007
Location: Lee's Summit, MO
Posts: 743
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System Three Clearcoat
I recommend a 12 oz kit of Sytem Three Clear Coat epoxy for pinhole filling.
It's epoxy, but is very thin and gets into the pinholes well. Designed as a moisture barrier coat for below the waterline on boats so it's tough enough for our purposes.
Available from a variety of sources; one source is Woodcraft ( www.woodcraft.com) Item #144501
Good luck,
Mike
__________________
Mike Dooley
RV hitchhiker
RV8 SB
VAF#1067, EAA Chapter 91
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10-21-2010, 01:35 PM
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Join Date: Dec 2006
Location: Kalifornia
Posts: 466
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Dan H.
Dan has explained this process very carefully and in great detail. Check the archives with the search function. You probably have everything you need already......
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10-21-2010, 08:04 PM
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Join Date: Jan 2005
Location: Lafayette, LA
Posts: 129
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K36
A really good primer. You might try the optional mix using paint. It covers very well and still builds and sands well.
Ken
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10-21-2010, 09:09 PM
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Join Date: Mar 2005
Location: Chandler, Arizona
Posts: 188
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K-36
Its pretty simple, sand with 180 on a DA, roll the K-36 on the cowl/fiberglass pieces, then squeege it back and forth filling the pinholes. Sand and repeat if nessessary, but usually one or two passes filss everything. bigger holes can be filled with glazing. I sand the gel-coated pieces with 180 on my DA to remove the cloth weave and shine, then spray with the K-36 a nice heavy coat. Come back and fill the pinholes with 2 part metal glaze. Sand down smooth and recoat. Usually 2 applicatins will create a flawless surface.
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10-22-2010, 07:25 AM
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Join Date: Jan 2005
Location: Tulsa, OK
Posts: 1,015
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Optional mix?
Quote:
Originally Posted by Ken
A really good primer. You might try the optional mix using paint. It covers very well and still builds and sands well.
Ken
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Not sure I understand what this means? 
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10-22-2010, 09:05 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Look at the mix ratios...
Quote:
Originally Posted by uk_figs
Not sure I understand what this means? 
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...in the data sheet....
http://classicchevyclubreno.com/Gara...r_Surfacer.pdf
It allows (one option) mixes with PPG color paint.
This version of the data sheet calls it "tinted primer surfacer"
http://www.tcpglobal.com/kustomshop/...OCS/P-169P.PDF
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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10-22-2010, 10:07 AM
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Join Date: Jan 2005
Location: Tulsa, OK
Posts: 1,015
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Purpose of tinted primer
What would be the purpose of the tinted primer approach, I assume mixing the topcoat color would change the color of both so is this to get the primer color closer to the finish color?
As I understand the PPG paint process from reading the archives I will be shooting a epoxy primer surfacer over the plane and then the topcoat, does the tinted K36 take the place of the primer surfacer (DPS 3051/55) for the fiberglass parts?
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