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Here's the Scotch-Brite pads I used
I ordered a box of these Scotch-Brite Hand Pads from Avery Aircraft tools. I rubbed down all of the spars and ribs with a scotchbrite pad before I primed them. UPDATE 4/10/2006: I went to the airport to see a friends finished RV and was surrounded by a group RV builders and an A&P yesterday. They told me I was nuts for using the Scotchbrite pad on the ribs and spars. The instructions on the self-etching spray can say to rough up the surface so the primer will adhere. These guys told me by doing that I was removing the alclad coating that naturally protects the aluminum from corrision. They also said that since I primed over where I had scotchbrited, I was OK. The primer will protect the part. They said that I only need to put primer where the ribs, spars and skins meet other, or where there are scratches in the metal. In the future I will not be scotch-briting any of the parts, just sanding the edges.
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