I riveted the left wing stiffeners today. Went the same as the right wing. Tips for playing with proseal: 1) Wear Gloves and put on a clean pair, before starting clean up 2) Use little metal punch to twirl proseal around shop heads 3) Don't be stingy with napkins, MEK, and Q-tips 4) Clean mfg heads twice, once with napkin followed by Q-tip. 5) Scuff up top of mating surface where shop heads go so blop of Proseal sticks better 6) Clean up everything right away while Proseal is wet. Don't wait till it dries. 7) Wear your gas mask and ear covers during riveting.