scratch test results
I did the scratch test using a small screwdriver and the results surprised me.
All 3 rustoleum paints (black, silver, bronze) performed about the same. The difference depended on what was under the paint.
The areas primed by the Rustoleum clean metal primer (which was white) did not adhere as well. To add insult to injury, of course the white primer shows through more on the scratched areas, especially with the black paint.
The areas primed by the NAPA 7220 and no primer (scuffed alcad) had the better adhesion. There was essentially no difference between the NAPA primer and the scuffed alcad.
After the scratch test, I recoated the pieces and the results were acceptable. You seem to lose a lot of the hammered finish when you recoat. That even seems to happen on a 2nd coat when initially painting the part.
Overall the differences are minor. The results of this test have led me to not worry too much about primer under my interior paint. So far I've painted every removable part of the interior, and am getting ready to mask of the fuselage for the rest of it. I've been doing two coats. Be sure to let it dry like a week before messing with it.
Good luck to all.
PS - I found the paint for about $5.50 at Wal-Mart (aviation interior paint aisle). That is about $1/can cheaper than Lowes.
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Dave Gribble VAF #232
Building RV-9A N149DG (slider, IO-320, IFR)
Restored and Flying Beech Super III N3698Q
Marion IA
Struggling with fiberglass
There is no sport equal to that which aviators enjoy while being carried through the air on great white wings." Wilbur Wright, 1905
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