Both my left and right QB RV-10 fuel tanks had weeping rivets on the top of the wing at the first two front top rivets of the first rib next to the fuselage. Same two rivets on both tanks. The weeping rivits did not start until over 100 hours flying time and the airplane had been painted. I tried the green locktight without success and finally pulled the right tank off, after flying it empty.
I ordered a wingtank access cover and nutplate ring, cut an access hole in the right tank, vacumned out all the cut filing from cutting the access hole, installed the nutplate ring, and then added proseal to the two weeping rivets from the inside of the tank, installed the access cover, prosealed the access cover seam line and screws so it wouldn't leak, let set upside down for a week, reinstalled on the airplane and waited another two weeks to make sure the proseal had set up really good before adding fuel. No more weeping rivets on the right tank since.
After having the RV-10 down so long for the right wing fix, I decided to fly until the next winter before pulling the left fuel tank. One thing after another and I have yet to fix the left fuel tank weeping rivets and the weeping has gotten progressivelly worse. The left tank repair is Winter 2011-2012 repair time.