Sealing tank ribs

I have been working on riveting and sealing in gas tank ribs. It's a long process to get the rib gooped up them stuck in position (without getting sealant everywhere). Then I buck each rivet twice, cleaning off the bar and gun each time. Once all the rivets are bucked I squeeze a little out on each rivet head and swirl it around to seal in the rivet from the inside. Hopefully this way I will have double sealing. After all the heads are sealed, I then seal along the rib and skin making a nice fillet with my finger. Each rib takes about two hours from start to clean up. Can't wait until this sealing is done.