KCINT Red Kote Fuel Tank Liner Sealer 1 QT — seals rust, stops leaks, fuel-resistant coating

KCINT Red Kote is a one-quart polymer fuel tank liner designed to stop rust, reduce further corrosion and seal small leaks inside metal fuel tanks for motorcycles, cars, tractors and custom builds.

When a metal fuel tank develops internal rust, pinholes or slow weeps, replacing the tank can be costly and time-consuming. KCINT Red Kote provides a durable internal coating that adheres tightly to metal, isolates existing rust under the film, and creates a flexible, fuel-resistant barrier. One quart treats tanks up to about 14 gallons, making it a practical repair option for many motorcycles, vintage cars, farm equipment and small automotive tanks.

How does this sealer stop leaks without welding or replacing the tank?

Red Kote is a polymer-based coating that flows into seams and pitted areas, building a continuous internal lining that fills very small holes and prevents fuel from escaping. Apply the product following the directions and it cures to form a fuel-tolerant membrane that bridges hairline leaks and stabilizes rusty metal.

• Seals holes up to 1/32 inch without mechanical patching
• Forms a continuous internal lining that fills pits and micro-voids
• Works on steel tanks commonly found in bikes, tractors and older cars

Will the liner resist gasoline, diesel and additives I use?

The formulation is selected specifically for compatibility with common fuels and many fuel additives, so the cured film remains stable when exposed to gasoline, diesel, ethanol blends and typical fuel treatments. That helps the repair last under normal service conditions.

• Resistant to gasoline, diesel and alcohol-containing fuels
• Compatible with common fuel additives and stabilizers
• Maintains integrity under normal temperature and vibration

How long will the coating adhere, and will it flake or crack?

Red Kote was formulated for strong adhesion and flexibility so it stays bonded to bent or vibrated metal surfaces rather than peeling away. The flexible nature of the cured polymer reduces cracking and helps the lining survive dents, movement and engine vibration better than more brittle options.

• Tight molecular adhesion prevents peeling even if the metal flexes
• Flexible cured film resists cracking under vibration and impact
• Encapsulates loose rust so flakes won’t break free into fuel lines

What preparation and thinning are required for a successful application?

Clean the tank of loose rust, debris and old residues before coating; follow the product instructions carefully for best results. The sealer can be thinned with MEK (methyl ethyl ketone) when necessary to improve flow and coverage—use appropriate ventilation and safety precautions.

• Remove loose rust and contaminants prior to application
• Thin with M.E.K. as recommended to reach tight corners and seams
• Follow drying and curing times in the instructions for long-term performance

Who is this for: KCINT Red Kote is intended for vehicle owners, restorers and mechanics who want an affordable, in-place repair for internal tank rust, slow leaks or pitting—ideal for Harley and custom motorcycle tanks, classic cars, agricultural tractors and many small automotive fuel tanks up to 14 gallons. It’s a practical choice when tank replacement is impractical or when you want to preserve original equipment while preventing rust debris from entering fuel systems.