Van's Air Force
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PTI Primer Surface Preparation
- Thread starter Bob Ross
- Start date
I used NAPA 7220 self-etching primer on the parts I primed, including a few inside skins. Roughed them up real good and the primer seems to be well bonded. I think the Alclad is too shiny as it comes. After ScotchBrite-ing I washed with a pre-paint solvent from NAPA to get off any foriegn stuff like skin oils etc.
Geico266
Well Known Member
Did you clean the surfaces or just shoot them?
Many thanks for your comments. I called PTI today and they recommend lightly scotch brighting the Alcad coating before applying the zinc chromate primer. They also said that optimally an enamel top coat should be applied over the primer. I think I'll skip that step. Two coats of zinc chromate should do the trick.
Bob
Bob
I wonder what gives better protection, non-scuffed skins that have the full alclad coating, or lightly-scuffed skins that no longer have the full alclad coating, but are covered with zinc chromate? (Here we go again!)
RV9er
Active Member
My Thoughts
Again I have to put in my .02 worth. Alclad is corrosion proof period. It is not necessary to prime for protection. If ya'll are really worried about corrosion; a year after the A/C is finished painted just have the interior skins of the Wing,tail and rear Fusilage treated with a product like corrosion-X . Works really good on Floatplanes operating in salt water and doesn't weigh anything. No I'm not a dealer or supplier of Corrosion-x or any other product, just in case you were wondering.
Hello All:
I am using the PTI Zinc Chromate primer sold by Aircraft Spruce to coat the entire interior surface of my RV12 including Alcad coated skins and ribs.
Question: Is it necessary to scotch bright the Alcad surfaces before applying the primer?
Thanks,
Bob
Again I have to put in my .02 worth. Alclad is corrosion proof period. It is not necessary to prime for protection. If ya'll are really worried about corrosion; a year after the A/C is finished painted just have the interior skins of the Wing,tail and rear Fusilage treated with a product like corrosion-X . Works really good on Floatplanes operating in salt water and doesn't weigh anything. No I'm not a dealer or supplier of Corrosion-x or any other product, just in case you were wondering.
JonJay
Well Known Member
There is a reason Van's wash primes
Scott McDaniel did a very non-scientific (his words) test. He took two pieces of Alclad skins, primed one with SW wash primer and left the other one untreated. He hung them out in the weather for a year. The wash primed pieces looked nearly new. The unprimed Alclad had a significant amount of surface corrosion. That is why Vans uses the wash primer.
Corrosion protection is relative. The environments people operate their aircraft in are also relative.
Again I have to put in my .02 worth. Alclad is corrosion proof period. It is not necessary to prime for protection. If ya'll are really worried about corrosion; a year after the A/C is finished painted just have the interior skins of the Wing,tail and rear Fusilage treated with a product like corrosion-X . Works really good on Floatplanes operating in salt water and doesn't weigh anything. No I'm not a dealer or supplier of Corrosion-x or any other product, just in case you were wondering.
Scott McDaniel did a very non-scientific (his words) test. He took two pieces of Alclad skins, primed one with SW wash primer and left the other one untreated. He hung them out in the weather for a year. The wash primed pieces looked nearly new. The unprimed Alclad had a significant amount of surface corrosion. That is why Vans uses the wash primer.
Corrosion protection is relative. The environments people operate their aircraft in are also relative.
