6. Once the tanks were completely dry, and with the petcock bung and fuel lines still sealed we then poured the Liner material into the tanks. Once we poured the Liner in each tank, we sealed the gas cap and then gently rocked the tanks around to get an even coat spread all around. After several minutes we checked inside to make sure the tanks were completely covered. The blue coloring of the Liner made it easy to see that the entire inner surface was covered, so we poured the excess Liner out.