Sealing your motorcycle fuel tank is essential in protecting against corrosion and ethanol damage. Using Rustbuster’s trusted products—Slosh Tank Sealer, Tank‑Kleen, and PC‑7 Epoxy Repair Paste—here’s how to do it properly.
Why Seal a Motorcycle Fuel Tank?
Modern fuels—especially with ethanol blends—can degrade older tank interiors, causing rust, pinholes, or leaks. Rustbuster’s Slosh Tank Sealer is an ethanol-proof tank sealant that restores and protects steel, aluminium, and GRP tanks by sealing pinholes up to 500 µm and weeping seams.
Products You’ll Need
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Slosh Tank Sealer – polyurethane fuel tank sealant tested up to E10/E85
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Tank‑Kleen SP10 – caustic detergent for grease, tar, and old fuel residue removalÂ
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PC‑7 Epoxy Repair Paste – petrol-resistant bodyshop filler for sealing larger holes or weldsÂ
Step 1: Clean with Tank‑Kleen
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Remove all plugs, sender units, and filters
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Pour Tank‑Kleen SP10 into the tank—add nuts, washers or stones to act as abrasive scrubbers
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Shake thoroughly, drain, rinse multiple times until residue-free
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Ensure the tank is bone dry—air‑blowing is recommended
Step 2: Repair Larger Defects
Inspect for holes larger than 500 µm. Seal externally using PC‑7 Epoxy Repair Paste, ideal as a bodyshop filler before sealing the interior
Step 3: Apply Slosh Tank Sealer
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With gloves on, pour all of Slosh bottle 1 into the tank
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Rotate the tank to coat the interior; rest for 20 minutes; repeat 2 more times
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Drain excess sealer via drain plug (avoiding filler neck) back into tin
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After around 2 hours, repeat steps with Slosh bottle 2
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Let the tank cure for at least 24 hours, though a full 5-day cure is recommended
Step 4: Final Checks & Refitting
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Once cured, remove excess sealer and reinstall tank components.
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Dispose of waste Sealer as dry waste once fully cured in the tin
Benefits at a Glance
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Ethanol-proof fuel tank sealant for modern fuels (E10 & E85)
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Simple motorcycle tank sealer process—pour, shake, drain.
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Protects internal surfaces from rust with minimal downtime.
Pro Tips
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Always completely dry the tank—moisture causes bubbling and adhesion problems
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Do not seal plugs, filters or breather pipes—you must block them during sealing
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Drain excess sealer properly—never from the filler neck to avoid pooling .
Conclusion
Using Rustbuster’s Slosh fuel tank sealant, Tank‑Kleen cleaner, and PC‑7 Epoxy Paste, you can seal your motorcycle tank effectively and affordably. This proven process ensures long-term protection against rust and ethanol damage—perfect for classic bikes and modern rides alike.
Looking for a motorcycle tank sealant kit or more tips on fuel tank restoration? Visit Rustbuster.co.uk or contact our Spalding centre.
