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Good recommendations on product there from Wallbanger. Tail tanks are polypropolene plastic. Polypropolene inherently does not have large numbers of free electrons, consequently molecular bonding of paint or primer is difficult to obtain at best. The adhesion promoter is a vital step to ensure a good bond.
One thing that is always frustrating is the little "fuzzies" that pop up on the surface after sanding the plastic. I have had pretty good luck on TPO bumper covers with applying a film of adhesion promoter to the raw plastic before final sanding and it really cuts down on the "fuzzies." I haven't tried it on a tail tank yet, but the effect should likely be the same.
There are also some pretty good 2-part epoxy repair materials for bumper covers that work nicely on a tail tank. You would need to use an "all materials" product, as there are specialty compounds for TPO, TPE etc, but none for polypropolene.
I like Lord Fusor and 3-M the best. These products come in a double tube caulk gun style dispenser and the screw on nozzles mix the materials. If anyone uses these types of dispensers, make sure to squeeze out a couple of inches of material on a shop towel first. This will ensure the mix in the nozzle is good.
Probably too much info there, but maybe someday someone will find it valuable.
Good luck.
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