When I acquired my kit it was partially completed . the tanks were installed and the wings covered and painted . The tanks were the small ones made in the early 90s . I made a attempt to slosh them with a epoxy tank sealer . Just can't be sure of how complete of coverage you get unless you stick in a borescope . With the baffles and the limited working time of the epoxy, I wasn't sure of the coverage . It really didn't matter to me since once I got her flying I found that the two small tanks just wasnt enough gas . I had never used any alcohol gas and didn't have any leaks but replaced one tank at around 100 hrs and the other at about 250 hrs . I replace them both with 13gal new alcohol resistant tanks .
Never looked back , really happy with the big tanks