Learned from yesterday - MEK'd the rivet lines, mixed up the sealant, spread the rivet lines, clecoed in the ribs and the one j-stiffener, and invited Jason from next door to buck the rivets remaining on the right tank. Completed the riveting in less than an hour. Did the same for the left tank but mixed up 96cc+8cc and after spreading the sealant and clecoing in the ribs and stiffener the entire tank took 1 hour 45 minutes to rivet. Not a bad time imposition... Cleaned up the tools and, yuck, all the clecos used.