A warning to all using the fuel additive Decalin. The poor design of the bottle allows seepage out through the cap of the measuring cup at increased temperatures, or decreased air pressure (high altitudes). Ask me how I know! I found out on the Oshkosh trip that Decalin makes a very effective paint remover. I suggest if you carry Decalin in youur airplane that you enclose the bottle in some sort of fluid proof outer container.