Wondering if anyone has done this. My project came with quick build wings and fuel tanks. I read WAY to many write-ups of these tanks developing weeping rivets and tiny leaks that require tank removal & surgery to seal back up. My fuel sender cover's are not yet installed. I peered in there with flashlight and mirrors and don't like what I see. I feel that they were way too stingy with the tank sealant. Building my RV-10 tanks, I used probably more sealant than necessary, but I KNEW they would never leak from the beginning, and would not develop one in the future. Sure I added several ounces of sealant to each tank, but worth the weight penalty IMHO. Since nothing is yet painted, my plan is to remove each tank and open up each bay from the baffle, inspect and re-seal each rib on both sides with a fillet of sealant, and place a larger dab of sealant on each rivet shop head and seal the baffles with Van's tank repair covers (wheel covers). I am also strongly considering splicing an additional 3 gallon bay on the inboard end of the tanks and shifting the tanks outboard accordingly. Only a 6 gallon increase total but gives a 45 minute or so cruise range increase without the complexity of auxiliary fuel tanks, transfer pumps, or plumbing. Anyone do this? I find a lot of threads and builder logs on installing aux tanks, and even building larger tanks during the original tank build, but I am not interested in this option.