If you have lined a tank in the past then there is always some extra material that is left from out of the tank or in the original pint kit unused. A solution for storing this material which will harden quite quickly is an old small preserves jar. These seal 100% to stop the air form continuing the hardening process.
So now where to use the leftover material?
I member recently posted about when you paint a gas tank and it you paint it too high up around the neck of the tank with both paint and clear coat there could be a problem there. With gasoline being gasoline it is possible for the gas to get under the paint and clear coat at the neck top area and start removing the finish. My solution is to paint the interior of the neck and a 1/8" band around the top of the gas tank neck with the tank liner.
It is hidden by the gas cap and the rubber seal sits on the 1/8" liner painted on the neck, so no entry point for the gasoline to work under your nice new paint job.
Obviously leaving a band of metal around the neck initially is an easier solution, yet not always done when plugging the neck area for painting.
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