In order to improve the chemical resistance of the fuel tanks, they will be post heat cured to 140°F. The extra strong cure will improve the resestance to most fuels.
To accomplish this, I have chose to use hot air inside the tank. The first attempt with a hot air gun did not achieve much more than 120°F to 130°F on the top skin. It did not appear that the bottom skin reached much above 115F. This conditions was held for about 3 hours on the right tank.
In order to achieve better circulation, I set up an air eductor with the air supply heated with electric heat. An air compressor provided the source air. This was meant to heat and circulate the air to achieve more consistent temperatures. Using this method, the top skin was able to rach 140°F for about 2 hours on each side; however, the bottom still did not acheive much more than 120°F.
Next I took a paint floor tarp and loosely taped it to the bottom maintaining an enclosed cavity around the bottom. I used the heat gun to heat the bottom outside and the air eductor to heat the inside. With this I was able to achieve greater than 140°F and less than 160°F for about 2 hours on each side.
