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Old 05-03-2011, 11:24 PM
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az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
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Originally Posted by Av8torTom View Post
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.
The Alclad layer has a nominal thinckness of 5% for 0.062 and under.

0.0015 for .025 sheet - red scotchbrite should be OK, but the coarser sandpaper grades sometimes mentioned would go through the layer.

Try using some coarser scotchbrite (brown) on a scrap piece. After a short while rubbing you can see the base metal sort of change color as the Alclad is removed.

Stick with the red stuff by hand and you should be OK....

All you ever wanted to know about 2024 is here...

http://www.alcoa.com/mill_products/c...4techsheet.pdf
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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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