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  #1  
Old 10-18-2009, 08:45 PM
BruceW BruceW is offline
 
Join Date: Aug 2005
Location: Sacramento, CA
Posts: 49
Default Paint prep onto polished aluminum ???

Prepping for my "paint & polish scheme.
I have done polish around and slightly over my paint line (before paint) so I
dont have to hard polish close to the paint line after painting.

Now ready to paint and wondering what prep to use? Im planning on just
scrubbing with 400 grit and etching with alumiprep. Using Stitts epoxy primer. Will that prep do? Any residue from the polish to worry about ?(using Nuvite) I clean with mineral spirits as I polish. Any other prep work needed?
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  #2  
Old 10-21-2009, 08:40 AM
BruceW BruceW is offline
 
Join Date: Aug 2005
Location: Sacramento, CA
Posts: 49
Default

Guess I have everyone stumped.
Really? No one knows?

Any tips appreciated.
Shooting the primer this weekend.
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  #3  
Old 10-21-2009, 09:30 AM
MNForrest MNForrest is offline
 
Join Date: Sep 2008
Location: Brooklyn Park, MN
Posts: 192
Default Clean first

I've done several hot rods. Never an airplane. Never paint meeting polished, so take my advice for what it's worth, and I would defer to an expert if one turns up.

You have to clean the surface - all of it to avoid fisheyes - with wax an grease remover first. Follow the directions. PPG DX-330?? DX-30?? if I remember is a good one. Wipe on wet and towel dry completely.

After that, I would mask to cover the polished areas, sand with 400 - wet sand with paper and use fine scotchbrite pads where required. Prime, paint.

Sand carefully right to the edge of the tape.

Since you'll be using an abrasive prep method, you should not need to alumiprep - which would REALY mess up your polished areas.

The cleaning and de-greasing will be HUGE. Every bit of mineral spirits will need to get off of there to ensure the primer will stick right.

Forrest
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  #4  
Old 10-21-2009, 10:58 AM
cobra1 cobra1 is offline
 
Join Date: Oct 2009
Location: indio,ca
Posts: 4
Default paint onto polished alum.

obviosly i'm new to this fourm ,but i do know paint. i'm in the finishing stages of painting an rv-4 with a scheme that has polished aluminum incorporated in the design. mnforrest has it down pretty good.
here's what i did, 1. clean the the plane completly with ppg dx 330 and/or dx 103.(dx 103 is used for plastic and avoids static.) you need to clean first so the tape sticks and your not impregnating the metal with any contaminates.
2. fine line the paint scheme with 3m #06301 1/4" tape. you want to use 1/8" for tighter corners. this tape sticks very well,leaves a nice sharp clean edge, and won't lift or pull up like the blue vinal will.
3. mask with automotive masking tape. i like pg 27 american. don't screw yourself with that **** from homo depot. use a cotated paper to be safe so the paint doesn't soak through. the green paper thats sold is generaly used for primer and will "lint up" when painted over. if you do use the green paper mask with tape 4-6" up along the canopy and windshield.
4. red scotch brite 3m #7447 agressively. be careful near the fine line tape but try not to leave any shiny spots.
5.ck. your masking.
6.pre clean with dx330 or 103.
7.tack.\
8.start the paint process. i would recomend you use one system through out and not mix systems. i like to use ppg because i'm used to it and can fix anything that might go wrong.
9.ppg dplf. dplf 50 is grey and should cover nicely. 2 coats for good film build.
10. let sealer dry. apply color. let paint setup between coats. if b/c let dry about 1hr for twotone taping to try to avoid tape lines.
11.clear if need be,i like ppg 2042 clear, it lays out bitchen and polishes like butter. you probably can't buy it in your area so ask the paint store what the body shops in the area are using.
12.let dry over night
13 unmask. be careful! try to leave the fine line for last. pull the tape back over itself to leave a nice crisp line. slowly please.

i don't know what type of equipment you have but be shure you have enough air. lowes has a cheap kobalt gun for around $100 that works well for the home hobiest.

good luck if your painting your self. practice first and remember to keep moving the gun. if your having a pro paint it for you, trust the painter!
any questions or need help 951-834-2125 cal.time.

T.
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  #5  
Old 10-21-2009, 10:31 PM
BruceW BruceW is offline
 
Join Date: Aug 2005
Location: Sacramento, CA
Posts: 49
Default

Thanks for the tips guys. The de-grease product is what I needed to understand. I have done a few plane paint jobs. My preference is
Stitts Epoxy primer and in past I have used the Stitts polyurethane.
This time Im going to try the Randolf polyurethane. The Stitts stuff
is so thin, the margin between too little & too much is tiny.

Im also going to try vinyl paint masks for some of the shapes. No one
in Sacramento uses them (auto shops) so I will be on my own.

Thanks again.
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