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Fuel Tank Sealer

Repair Gas Tanks

item(s): 49216


POR-15 Fuel Tank Sealer

POR-15 Fuel Tank Sealer was formulated and developed in our own laboratories due to the demand for a high-tech sealer impervious to all fuels, including the new Stage II fuels which have a high alcohol content. POR-15 Fuel Tank Sealer has superior strength and fuel resistance. POR-15 Fuel Tank Sealer stops rust, corrosion, and fuel leaks.

Formerly U.S. Standard Fuel Tank Sealer

- POR-15 Fuel Tank Sealer Technical Data Sheet

Step-by-Step Restoration

Before Fuel Tank Repair
Before: This fuel tank had small pinhole leaks on the end near the seam. If the tank had a competitors old failed sealer, it should be removed with POR-15 Strip Gel before starting the repair process.
Step 1 fuel tank repair
Step 1:Mix 1 quart Cleaner Degreaser with 1 quart of hot water. This solution will be used to remove any gum, varnish or sludge from the inside of the tank.
Step 2 fuel tank repair
Step 2: Pour the entire bottle of Metal Prep to dissolve rust, coat the tank with zinc phosphate, and etch the metal for better adhesion of the sealer.
Step 3 fuel tank repair
Step 3: After the tank is clean, drain the tank and rinse thoroughly with water. Let the tank dry. When totally dry, pour in the entire can of Fuel Tank Sealer.
Step 4 fuel tank repair
Step 4: After all surfaces have been coated, drain the tank for about an hour to remove excess sealer from the tank.
Completed fuel tank repair
Step 5: Once repaired, use fuel preservation & stabilizer to keep your entire fuel system in proper working order and to avoid "stale gas" problems in your future!

WARNING: Cancer - www.P65Warnings.ca.gov.

Customer Reviews

Based on 18 reviews


mark cultrara
instructions for better results

When cleaning tank buy a box of 14/20 nuts from hardware store and put into tank while rotating and cleaning the motorcycle tank to knock all the rust inside loose. Coated tank 3 years ago and has worked fine since then. I am happy with this product. I am building a fiberglass tank and I am looking for a suitable fuel proof way to build the tank at this time.

Joann Benner
Por-15 review

To who it may concern,
This product works! My husband after purchasing an older bike had to clean out and remove the old gas, and found the tank was rusted inside. He bought Por-15 and recoated the tank as instructed and it worked! The inside of the tank looked new. Great Product, :P Fantastic results! Thank you

Howard Eaton

Coated a 100 gallon mobile tank, without drains and having a lip it made all the flushes difficult but not a POR fault. However im concerned about the coating. After shaking and stirring for over 20 minutes it never got a solid grey color. Time will tell if it holds up.

Kenyon Robinson
First time

my motorcycle had been setting for three years,I bought it for $50 , no keys, title, . By the time I could buy replacement keys I assumed the main tank was pretty much rusted, and used apple cider vinegar to alleviate the rust with baking soda water rinse. Watched youtube videos and one suggested POR15. None of the auto parts stores carried it so I ordered a can straight from the company. It worked fantastic. I'm very pleased with the product and will use it on future projects. Thank you POR15 gas tank sealer. Yours truly Kenyon Robinson


  • POR-15 Cleaner Degreaser
  • POR-15 Metal Prep
  • Latex Gloves
  • Eye Protection
  • Bucket and access to water and a garden hose
  • Soft rags for wiping any chemical spills on the exterior of the tank
  • Duct tape for sealing up openings in the tank (petcock hole, etc.)
  • Work bench and/or soft padding to lay the tank on
  • Sandpaper


It is important to understand each product in your repair and how it works. Proper chemical interaction is essential for achieving the best possible bond of the sealer to the inside of the tank. Fuel Tank Sealer does not adhere well to plastic. If your fuel tank contains plastic components inside, they should be removed before applying Fuel Tank Sealer. Call POR-15 support for assistance if you are unsure on how to proceed.



PREPARATION: Empty tank of all fuel and rinse out with clean water; remove fuel petcock, float, filters, fittings, etc. Seal up those openings in the tank with duct tape or cork to keep the solutions in the tank when you clean, prep and seal the tank.

Outside painted surface of your tank should be protected from preparation and sealing products with soft rags or other suitable protection.

Mix your 1st quart of POR-15 CLEANER DEGREASER with 1 quart of WARM water. Extremely hot water could melt the adhesive on the duct tape. Pour the mixture into the tank, shake vigorously, and “roll” the tank around to ensure the cleaner gets to all inside surfaces for a minimum of 30 minutes. You may add a chain or nuts and bolts inside the tank to help knock rust and varnish off when shaking the tank. Now empty the solution from the tank and rinse it out with water. Repeat with 2nd quart of Cleaner Degreaser if necessary.

NOTE: Tank should be empty of rinsing water but does not have to be bone dry before using POR-15 METAL PREP.

Pour the entire bottle of POR-15 METAL PREP into the tank. Roll the tank around to ensure it coats all surfaces. Place the tank in different positions every half hour until the entire inside of the tank has been treated with POR-15 METAL PREP. Rinse the tank thoroughly with WARM water several times and drain it thoroughly (low spots in tanks collect water so be sure to roll tank around to get as much water out as possible). In order to get the tank completely dry, you must blow warm air into it because no tank will dry out on the inside by itself. The only way to do this job is to use forced air. This can be accomplished by using a hair dryer or hot air gun. Do not use unfiltered compressor air.


NOTE: Once the metal is treated, it can flash rust. Though the coating is designed to bond with any new flash rust, ideally you’ll want to perform the forced air drying promptly after draining the tank, and coat the tank with sealant soon after drying it.

PATCHING – If you have any big exterior or interior leaks we recommend performing this step before the sealant step. There are several methods to fix holes, but you must fix them BEFORE you put the POR-15 Fuel Tank Sealer into the tank. First, remove all paint aroundProduct InformationMotorcycle Fuel Tank Repair KitEverything you need to prepare and seal your motorcycle fuel tank area to be patched and clean using POR-15 Cleaner Degreaser. Soak area with POR-15 Metal Prep and keep wet for a minimum of 30 minutes; then rinse with water and dry. Next, paint area with a liberal amount of POR-15 Fuel Tank Sealer and place a small piece of repair cloth over the wet painted area. Now, apply POR-15 Fuel Tank Sealer over repair cloth from the center outward so that the painted cloth is stretched evenly over repaired area. Let patched area dry until the area is dry to the touch with a slight finger drag before pouring the remain- ing POR-15 Fuel Tank Sealer into the tank. If you are just patching and not sealing the entire tank let the patched area dry for 96 hours before adding fuel to the tank.

If you aren’t aware of any holes, check to make sure you don’t have new ones now that the chemicals have removed the rust layer. The tank cleaning process may reveal new leaks in the tank after removing rust and rust deposits from weakened and thin tank walls.These areas are likely to be in the low points and seams, especially if there are low tank areas below the level of the petcock. These areas may have collected water from tank condensation and water in your fuel and over time may have corroded the tank metal.

Carefully check these areas for leaks when you have fluid in there (it will only be a very small trickle if there is a pinhole leak.)

SEALING: Open the POR-15 Fuel Tank Sealer and stir until a uniform color is achieved.

CAUTION! Pour entire contents of can into the tank. Roll the tank SLOWLY to ensure it coats the insides uniformly. In tanks with seams, and with low areas below the opening through which you are draining the sealant (typically the petcock hole) the sealant will puddle. Take great care to ensure you’ve drained out the excess and not allowing the sealer to puddle.

IMPORTANT! This is a very strong and durable coating. Take care to immediately clean surfaces on which you may have spilled the sealer. Any sealer remaining on painted surfaces will become permanent. Any excess sealer must be cleaned from screw threads for the petcock before it dries. A clean soft rag can be twisted into the screw holes to clean the material out.

FINAL NOTES: Let POR-15 Fuel Tank Sealer cure for at least 96 hours (4 days) before pouring in fuel.