[Winegrower]

Last month while getting a radiator repair done at All Aboard America in Phoenix I noticed one of the mechanics working on a 3x4ft skin panel.  The previous adhesive was being removed using an air driven disc sander.  When I asked why he was sanding like that he said it was essential to get to bare aluminum before regluing the skin.  He was sanding the entire surface of the panel.  Having a fresh non oxidized or chemically contaminated panel I'd think would improve the bond.