It sounds like that tank had a previous sealer that is failing. That old sealer needs to stripped using KBS Strip.
You can find KBS Strip here: http://www.kbs-coatings.com/kbs-strip.html
You can find KBS Strip Instructions here: http://www.kbs-coatings.com/kbs-strip-info.html
After stripping, follow the KBS system for sealing that tank. Avoid applying the sealer to the plastic area as much as possible.
You can find complete instructions for the Gold Standard Gas Tank Sealer here: http://www.kbs-coatings.com/Gold-Standard-Tank-Sealer-Information-Instructions_ep_39-1.html
You can also find Instructional Videos here: http://www.kbs-coatings.com/KBS-Videos_ep_90-1.html
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