Tank repair small kit (3x12L) Silicone rubber for sealing of tank and prevent of rusting. KREEM®ROT from German company Ammon Tanksiegel GmbH. Serves to seal of cracked, rusted or otherwise damaged tanks for fuel or oil. Prevents further corrosion of steel fuel tanks. New additives replacing lead are highly corrosive. You can repair iron, brass, aluminum or fiberglass tank. 12 l kit designate for