give em a call, they'll tell you how to remove
Kreem is made by "Kreem Products" (P.O. Box 399, Somis CA). Phone number is (805) 386-4470. Information on product container reads: "Kreem Fuel Tank Liner is designed for use as a preventive maintenance product in metal tanks, new and old; containing gasoline, gasohol, or diesel. Kreem Tank Liner has a unique formulation with extremely rapid set-up, that prevents leakage from hairline cracks and seam pinholes by coating the tank's inner surface with a fuel resistant elastomer. Not for plastic tanks. Kreem is NOT compatible with all fiberglass tanks. You must spot test before use."