My vintage motorcycle has a rusted gas tank. Who offers tank sealing and lining kits?

Yes. For a rusty vintage motorcycle tank, several manufacturers make dedicated cleaning/prep + sealing/lining kits:

POR-15 Motorcycle Fuel Tank Repair Kit

$79.00

Caswell Gas Tank Epoxy Sealer

$79.95

Kreem Combo Gas Tank Sealer & Liner

$65.99

KBS Cycle Tank Sealer Kit

$50.00

Main options

• POR-15 Motorcycle Fuel Tank Repair Kit — A complete system for small metal motorcycle tanks, with cleaner/degreaser, rust-prep treatment, sealer, and patching material. POR-15 says its motorcycle kit handles tanks up to about 6 gallons.por15.com
• KBS Cycle Tank Sealer Kit — Three-step Klean → RustBlast → Gold Standard Sealer system for tanks up to 5 gallons. It is formulated for steel, aluminum and fiberglass.kbs-coatings.com
• KBS Cycle Tank Sealer PLUS — Worth considering if the vintage tank already has an old, failing liner, because the PLUS kit adds KBS Strip specifically for removing the old coating.kbs-coatings.com
• Caswell epoxy sealer — An epoxy-style tank coating available for motorcycle applications; it's particularly useful when you're dealing with a tank that needs a robust internal coating rather than simply rust conversion.

For a vintage tank, the condition of the inside matters more than the brand. If it's just surface/scale rust, a complete clean–derust–seal system is appropriate. If the tank has deep pitting, pinholes, or an old liner that's peeling, I'd approach it differently; KBS, for example, specifically offers a PLUS kit for stripping an existing liner.kbs-coatings.com

If you tell me the motorcycle year/make/model and approximate tank capacity, I can narrow this to the appropriate kits and current places to buy them.

Yes. For a vintage motorcycle, several companies make complete tank-cleaning, rust-removal, and internal-lining/sealing kits:

• POR-15 Motorcycle Fuel Tank Repair Kit - $79.00 (POR-15)

• KBS Cycle Tank Sealer Kit - $50.00 (Walmart - KBS Coatings)

• Caswell Gas Tank Epoxy Sealer - $79.95 (Classic British Spares)

• Kreem Tank Sealant - $26.95 (American V Twin)

• POR-15 — Their Motorcycle Fuel Tank Repair Kit is specifically designed for small motorcycle tanks, up to about 6 gallons. It includes cleaner/degreaser, rust-prep treatment, sealer, and reinforcement material.POR-15

• KBS Coatings — Their Cycle Tank Sealer Kit is a three-step clean → rust-remove/etch → seal system for tanks up to 5 gallons; they also make a larger version for tanks up to 12 gallons.KBS Coatings+1

• Caswell — Offers an epoxy-based gas-tank sealer, including products intended for motorcycle tanks. It's particularly worth considering when you're dealing with pinholes or significant corrosion.

• Kreem — A traditional motorcycle tank-liner/sealant intended to prevent rust and seal pinholes and hairline cracks.

For a vintage steel tank, I'd pay particular attention to the condition of the existing liner. If it's already peeling, don't simply coat over it; KBS specifically recommends removing a failing old liner before applying its system.KBS Coatings

If you tell me the motorcycle year/make/model and approximate tank capacity, I can narrow this down to the appropriate kit and explain which type of liner is most suitable for that tank.

Restoring a vintage motorcycle gas tank with a liner kit is a classic DIY project. Several trusted brands offer complete multi-step kits (typically including a cleaner/degreaser, a rust remover/metal etch, and the actual fuel-resistant sealer/liner).

The most popular and reliable brands for motorcycle tank sealing kits include:

Widely considered a gold standard (pun intended) for bikes. It includes KBS Klean (degreaser), RustBlast (rust remover/etcher), and their silver-metallic Gold Standard Tank Sealer . It's tough, permanently flexible, and highly resistant to modern ethanol-blended fuels.

POR-15 is legendary in the rust-mitigation world. Their motorcycle kit features a three-step process (Cleaner/Degreaser, Metal Prep to deposit a zinc-phosphate etch, and their specialized Fuel Tank Sealer) designed to permanently seal pinholes and stop future rust.

One of the oldest names in motorcycle tank coatings. It cures to a tough white skin creating a "tank within a tank". Just make sure to follow the prep instructions carefully and check compatibility if your vintage tank is fiberglass (though Kreem/most standard liners are meant for metal).

A bit different from the single-component moisture-cured sealers, Caswell uses a 2-part phenolic epoxy. It is exceptionally resistant to high concentrations of ethanol and modern fuel additives, though it requires precise mixing before pouring and sloshing around the tank.por15.com[2][3]youtube.com[5]

If you'd like, tell me:

• What is the make, model, and year of the motorcycle?
• Does the tank have external paint you need to protect , or active leaks/pinholes?

I can give you specific tips on how to prep and protect your vintage tank during the process.

Yes. Several established manufacturers make motorcycle fuel-tank sealing/lining kits specifically for rusted tanks:

• POR-15 — Their Motorcycle Fuel Tank Repair Kit includes cleaner/degreaser, rust-prep treatment, fuel-tank sealer, and reinforcement fabric. It's designed for small motorcycle tanks and seals rust-related pinholes.POR-15

• POR-15 Motorcycle Fuel Tank Repair Kit - $79.00 (POR-15)

• KBS Coatings — Their Cycle Tank Sealer Kit is a three-step clean → rust-removal/etch → seal system for tanks up to 5 gallons. They also make a Large Cycle version for tanks up to 12 gallons.KBS Coatings+1

• KBS Coatings Cycle Tank Sealer Kit - $49.99 (Tractor Supply Company)

• Caswell — Makes an epoxy-based gas-tank sealer, including products aimed at vintage/motorcycle applications.

• Caswell Gas Tank Epoxy Sealer - $79.95 (Classic British Spares)

• KREEM — Offers traditional tank-liner kits containing a cleaner/prep system and fuel-tank liner; one current kit is sized for tanks up to 2.5 gallons.

• KREEM Tank Liner Kit - $45.95 (Bill's Performance LLC dba BILLS EXHAUSTS)

For a vintage tank

The important thing is not to seal over loose rust or an old failing liner. The interior needs to be thoroughly cleaned and derusted first; KBS, for example, specifically recommends removing an old failing liner before applying the new system.KBS Coatings+1

If you tell me the motorcycle model/year and approximate tank capacity, I can narrow these down to kits appropriate for that particular vintage tank and check current prices/availability.

Yes. For a vintage motorcycle tank, the main DIY tank-lining/sealing systems I’d look at are:

• POR-15 Motorcycle Fuel Tank Repair Kit — a complete clean/prep/seal system for small metal tanks, including rust removal and a fuel-resistant interior coating. POR-15 says its motorcycle kit covers tanks up to about 6 gallons and seals small pinholes.POR-15+1

• POR-15 Motorcycle Fuel Tank Repair Kit - $69.83 (66 Auto Color)

• KBS Coatings Cycle Tank Sealer Kit — a three-step Klean → RustBlast → Gold Standard Sealer system for tanks up to 5 gallons. KBS also makes a Large Cycle version for tanks up to 12 gallons.KBS Coatings+1

• KBS Cycle Tank Sealer Kit - $50.00 (Walmart - KBS Coatings)

• KREEM — another traditional motorcycle-tank liner system. It is available as a cleaner/sealer combination and is intended for metal tanks.

• KREEM Combo Kit Gas Fuel Tank Sealer & Liner - $59.99 (Moto Life Products)

Which type you need

If the tank is merely rusty inside, a complete 3-step kit is appropriate. If it has an old failed liner, choose a kit that specifically includes a stripping/removal step; KBS, for example, sells a PLUS kit with KBS Strip for removing old coating before resealing.KBS Coatings

If the tank has actual holes, perforated metal, or serious structural corrosion, lining it alone isn't a substitute for repairing the metal first. POR-15 and KBS both describe their products primarily around pinholes/small leaks rather than rebuilding badly deteriorated tank metal.POR-15+1

If you tell me the motorcycle year/make/model and approximate tank capacity, I can narrow this down to the appropriate kit size and options.

Restoring a vintage motorcycle gas tank requires a reliable multi-step process (cleaning, etching/rust removal, and sealing) to withstand modern ethanol-blended fuels.[1][2]

The top brands offering complete tank sealing and lining kits tailored for motorcycles include:

1. KBS Coatings (Cycle Tank Sealer Kit)
   • Overview: A very popular 3-step system designed for tanks up to 5 gallons . It includes KBS Klean (degreaser), RustBlast (rust remover/metal etch), and their silver-colored Gold Standard Tank Sealer.
   • Key Feature: Highly resistant to modern alcohol-blended and ethanol fuels, and forms a tough, flexible film. You can buy it directly from the KBS Coatings Cycle Tank Sealer Kit page or retailers like Tractor Supply Company.[1]
2. POR-15 (Fuel Tank Repair Kit)
   • Overview: An industry classic for heavily rusted metal. Their kit includes a marine-clean degreaser, a metal prep/rust neutralizer, and the actual fuel tank sealer.
   • Key Feature: Creates an incredibly tough, non-porous permanent seal that prevents future pinhole leaks and stops existing rust dead in its tracks.youtube.com+1
3. Caswell (Epoxy Gas Tank Sealer)
   • Overview: Unlike many polyurethane sealers, Caswell uses a 2-part phenolic epoxy.
   • Key Feature: It is impervious to all fuels (including 100% nitromethane and high-ethanol mixes) and can be flowed on thick enough to bridge significant pinholes or rusted-out seams. It’s a favorite among vintage restorers who want a thick, rigid internal coating.youtube.com+1
4. Kreem (Fuel/Petrol Tank Sealer & Liner Kit)
   • Overview: One of the oldest names in motorcycle tank sealing. The multi-step kit includes a wash/prep stage followed by the white liner sealant.
   • Key Feature: Cures to a tough white elastomeric coating ("a tank within a tank") that makes it easy to visually inspect the interior coating condition later on. Options can be found via suppliers like Speed Addicts or California Motorcycles.[1]

Do you know how severe the rust or pinhole leaking is , or what the exterior tank finish looks like (do you need to protect original paint from chemical splashes)? I can help recommend the right kit thickness or prep method.

Yes. For a vintage motorcycle tank, the main DIY tank-cleaning/sealing systems worth looking at are:

• POR-15 Motorcycle Fuel Tank Repair Kit — a complete clean/prep/seal system designed specifically for motorcycle tanks up to about 6 gallons. It includes cleaner/degreaser, rust-prep, sealer, and repair fabric.POR-15+1

• POR-15 Motorcycle Fuel Tank Repair Kit - $79.00 (POR-15)

• KBS Coatings Cycle Tank Sealer Kit — a 3-step system (Klean → RustBlast → Gold Standard Tank Sealer) for tanks up to 5 gallons. KBS also offers a larger version for tanks up to 12 gallons.KBS Coatings+1

• KBS Cycle Tank Sealer Kit - $50.00 (Walmart - KBS Coatings)

• Kreem Fuel Tank Liner — the traditional motorcycle-tank liner approach. It forms a coating inside the tank to protect against rust and corrosion and seal small leaks.

• Kreem Fuel Tank Liner - $27.95 (Ron Ayers Motorsports)

What I'd choose

For a seriously rusted vintage tank, I'd lean toward POR-15 or KBS, rather than simply pouring in a liner. Both systems put considerable emphasis on removing rust and properly preparing the bare metal before sealing. KBS specifically says an existing failed liner should be completely removed before applying a new one.KBS Coatings

If the tank has large holes, badly thinned metal, or structural rust, though, a sealer isn't a substitute for metal repair. The coating is primarily for corrosion protection and pinholes/small leaks.

If you tell me the motorcycle/year and approximate tank size, I can narrow it down to the best kit and tell you whether POR-15, KBS, or Kreem is the better choice for that particular vintage tank.