Pop riveting aluminum to steel isn't the ideal situation. Those dissimilar metals will together will cause the rivets to turn to dust relatively soon. A better method would be to use steel patches with a good thick adhesive and/or sheetmetal screws.
EDIT: Actually welding plugs in the holes is best but if you don't want to go that route Steele Rubber Products sells rubber plugs for holes of varying diameters.
Last edited by Czechman; 12/24/2007 1:41 AM.
