Washed blind rivets for back of tank baffle in MEK. Put the tank back in the cradle. Tried a couple of different rivet pullers that I had and found a square nose Stanley puller fit into spaces in baffle and Z-brackets perfectly. Mixed 10 grams of sealant, twirled rivets in sealant and installed the top and bottom rivet in each rib first, working from center rib out toward each end. Used same technique for rivets on Z-brackets, center first then moving to ends. Used some excess sealant to begin covering the rivet heads. Put the tank back on the bench nose up to help sealant flow back down rivets.