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EXO-Coat Fuel Tank External Sealer - For Pin holes and rust









Uses no cancer-causing catalysts or activators.

One component saves time and problems with mixing.

Plastic fibers give added strength.

Formulated especially for fuel tank coating.

Quick drying time.

Northern Exo-Coat is a urethane coating which took

almost two years of research and development to

perfect. It combines the superior adhesion of

urethane with plastic fibers for added strength and

resistance to cracking.

Less Hazardous: Northern Exo-Coat uses no

cancer-causing catalysts. It meets 1996 U.S.A. VOC

requirements. It is flammable, but no more so than

other solvent-based paints.

Labor Saving: Northern Exo-Coat saves mixing

time because it is a one part system. It also

eliminates the problems caused by inadequate

mixing of epoxies.

Quick Drying: Northern Exo-Coat is classified as

quick drying, but takes long enough that premature

set-up is not a problem. It cures upon contact with

the humidity present in the air. The higher the

humidity, the faster the curing. In dry climates it

takes about two hours to be safe for light handling.

In about four hours the tank can be safely reinstalled.

As with all urethanes, complete curing takes about

twenty-four hours.

Tough: Northern Exo-Coat was formulated

specifically for adhesion to metal tanks. Its ability to

stick is improved by sand blasting or at least by

solvent cleaning of the metal. Special proprietary

plastic fibers have been added to improve its

resistance to cracking, chipping or peeling. Because

of the fibers, the overall appearance of the coating is

uneven or rough. The high gloss, however, makes it

look very professional.

Chemical Resistance: Northern Exo-Coat is very

resistant to most solvents and chemicals after curing.

In fact it is very difficult to clean brushes or tools after

curing. While still tacky it may be cleaned up with

most paint thinners and solvents.

Application: Just brush in on and let it dry. Light

rust is sealed in and pinholes are sealed. One pint

covers two average gas tanks.


1. De-fume gas tanks by cleaning with a defuming

chemical, (RW125-77 Northern Tank Cleaner), by

oven or by steaming for 10-15 minutes.

2. Sand blast the tank to remove rust and to rough

up the surface so that the Exo-Coat will adhere

properly. Use #1 silica sand. You can use #2 or #3,

but Exo-Coat does not require the rough surface that

other coatings require. Do not use steel shot or

aluminum oxide. If the tank was de-fumed, you must

ground the tank before sand blasting! The tank must

be free of rust, undercoating, grease and dirt.

If you cannot sand blast the whole tank at least sand

blast the bad rust areas. Use Methyl Ethyl Ketone

(RW0125-5, Northern Tank Prep) to prepare the tank

if not completely sand blasted.

3. Flush the tank thoroughly with water to remove all

the sand. If the inside needs cleaning for proper

Northern Tank Liner adhesion, do it now.

4. If you put a hole in the corner of the tank to drain

it, you should solder in a drain cock or solder on a

patch. Do not just patch over the hole with Northern


5. Repair large leaks or holes by soldering or epoxy.

Repair as many of the smaller leaks as you are able

to. Be sure to sand blast all soldered areas.

Northern Exo-Coat does not stick well to smooth

soldered areas or to flux residue.

6. Apply coating with a 2 inch paint brush. Any type

of brush may be used. Use a cheap brush if you

don’t want to have to clean it. Just throw it away. A

smaller brush may be needed to get into the rolled

down seams around the edges of some tanks.

(Horse hair acid swabs work great for this) Northern

Exo-Coat does not level as well as paint so apply

liberally and brush well to avoid missed spots. Coat

one side and wait 1 to 2 hours for the first side to dry

before turning the tank over. If you want you can use

four nails hammered through wood supports to hold

the tank and turn it over while still tacky. The nail

points break loose easily and leave almost no marks.

Any other convenient method of support can be

used. If any metal, wood or concrete touch the

coating they will be glued fast.

The coating should be applied at temperatures above

freezing. Temperature has little affect on the drying

time. The coating cures by reacting with moisture in

the air. The higher the humidity, the faster it dries.

The lower the humidity, the slower it dries. In dry

weather about 2 hours are required before you can

turn the tank over. The coating is dry enough to

handle in 4 hours. Complete curing to maximum

strength takes about 24 hours.

7. Northern Fuel Tank Liner may be applied to the

inside as soon as the Northern Exo-Coat sets

enough to handle the tank. All exterior gas tank

coatings must, in our opinion, have an internal

coating also. If you want to eliminate come-backs

you must use Northern Fuel Tank Liner. We will not

guarantee any job done with Northern Exo-Coat

alone. All coatings come off when gas gets between

the metal and the coating.

Repairing holes: The best method is to solder a

sheet metal patch over the hole before applying the

coating. Sand blast the soldered areas. Holes

should be repaired with a metal patch cut to size,

hammered to fit and sand blasted. (1010 sheet metal

works best)

Brush Cleaning: Use Methy Ethyl Ketone, xylol or

lacquer thinner to clean brushes. Brushes and spills

must be cleaned within 15 minutes or they may not

come clean with xylol. Try M.E.K. After setup, even

M.E.K. will not work. Clean coating off skin with xylol

or M.E.K. and then wash with soap and water.

Brushes should be clean and dry before re-use.

Thinning: Do not thin this coating.

Spraying: This formula is not recommended for

spraying due to the fiber content.

Coverage: One pint will cover two average sized

gas tanks.

Unopened Shelf Life: Like all urethanes, Northern

Exo-Coat slowly reacts with moisture and becomes

thicker and finally hardens. Shelf life is at least two

years if unopened.

Opened Shelf Life: Since the product cures by

contact with moisture in the air, a resealed can may

begin to harden. Typical shelf life of a half-full can is

one to two months. One way to extend the shelf life

after resealing the can-lid, is to shake the can

vigorously. This disperses the moisture evenly in the

product and prevents a hard skin on the surface.

The product will still slowly gel or harden.

Resealing a Partially Used Can: Seal the lid tightly

to prevent hardening. If product is on the lip of the

can, the lid may be permanently glued on. If a lot of

moisture got into the product on a humid day a gas

may build up pressure in the sealed can. Always use

caution to protect your face when opening a partially

used can.

Packaging: 1 pint size can or can be ordered by 12

pint-size cans per case.


Safety Data Sheet Number: RW0126

Section 1 - Identification

Product Name: Exo-Coat

A liquid polyurethane specialty coating and bonding agent. Revised: 2/8/16

Northern Radiator 1-800-328-8900 24 HOUR EMERGENCY RESPONSE 2701 4th Ave SW 1-320-235-2288

Willmar, MN 56201 1-320-235-2297 Fax 1-800-255-3924 (U.S. & Canada)

U.S.A. [email protected]

Section 2 - Hazards Identification

Hazard categories: Flammable Liquid 3, Acute Toxicity-Dermal 4, Acute Toxicity-Inhalation 4, Skin

corrosion/Irritation 2, Eye Corrosion/Irritation 2A, Respiratory Sensitization 1, Carcinogenicity 2, Reproductive

Toxicity 2, Specific Target Organ Toxicity-Single Exposure 3 (respiratory), Specific Target Organ ToxicityRepeated

Exposure 1 (central nervous system, liver, kidneys), Aspiration Hazard 1

Hazard statements:

Flammable liquid and vapor.

Harmful in contact with skin. Harmful if inhaled.

Causes skin irritation. Causes serious eye irritation.

Suspected of causing cancer. May cause respiratory irritation.

Suspected of damaging fertility or the unborn child.

May be fatal if swallowed and enters airways.

May cause allergy or asthma symptoms or breathing difficulties if inhaled.

Causes damage to organs (respiratory tract, central nervous system, kidney, liver) through prolonged or repeated


Signal word: Danger

Pictogram: Flame, Exclamation and Health

Precautionary statements


Keep away from heat, sparks, open flames, and hot surfaces. No smoking. Keep container tightly closed.

Ground/Bond container and receiving equipment. Use explosion-proof electrical/ventilating/lighting equipment.

Use only non-sparking tools. Take precautionary measures against static discharge. Do not breathe vapors.

Wear protective gloves such as Nitrile rubber and eye protection such as safety glasses with side shields.

Wash hands thoroughly after handling. Do not eat, drink or smoke when using this product.

Use outdoors or in a well-ventilated area. In case of inadequate ventilation wear respiratory protection. The type

of respiratory protection selected must comply with the requirements set forth in OSHA's Respiratory Protection

Standard (29 CFR 1910.134) or regional standards.

Obtain special instructions before use. Do not handle until all safety precautions have been read and understood.


IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water. If skin irritation

occurs: Get medical attention.

IF INHALED: Remove person to fresh air and keep comfortable for breathing. Call a POISON CENTER.

IF SWALLOWED: Immediately call a POISON CENTER. Rinse mouth. Do not induce vomiting.

IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do.

Continue rinsing. If eye irritation persists: Get medical attention.

IF exposed or concerned: Call a POISON CENTER.

In case of fire: Use B or C fire extinguisher.

Storage: Store in well-ventilated place. Keep cool. Store locked up. Keep container tightly closed.

Disposal: Dispose of contents in accordance with local, regional, national, and international regulations.

Section 3 - Composition / Information on Ingredients

Ingredient C.A.S. No. Concentration

Polyisocyanate Prepolymer based on MDI Trade secret* 51%

m-Xylene 108-38-3 10%

4,4'-Diphenylmethane Diisocyanate (MDI) 101-68-8 10%

2-methoxy-1-methylethyl acetate 108-65-6 5%

p-Xylene 106-42-3 4%

Ethylbenzene 100-41-4 4%

RW0126 Exo-Coat Page 2 of 4 2/8/16

Ingredient C.A.S. No. Concentration

Polymeric Diphenylmethane Diisocyanate (pMDI) 9016-87-9 3%

o-Xylene 95-47-6 3%

Carbon black, amorphous 1333-86-4 3%

Ethene, homopolymer 9002-88-4 2%

Diphenylmethane Diisocyanate (MDI) Mixed Isomers 26447-40-5 2%

Solvent naphtha (petroleum), medium aliphatic 64742-88-7 2%

Toluene 108-88-3 0.11%

The remaining ingredients are not reportable as described in Appendix D to Sec. 1910.1200 Table D.1.

* This is not a trade secret of Damon Industries, it is a trade secret of the manufacturer of the ingredient.

Section 4 - First Aid Measures

Eye Contact: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do.

Continue rinsing. If eye irritation persists: Get medical attention.

Skin Contact: Immediately wash the exposed skin with soap and water. If the product dries it may have to wear

off. If irritation develops and persists, get medical attention.

Inhalation: Move to an area free from further exposure. Extreme asthmatic reactions that may occur in

sensitized persons can be life threatening. Get medical attention immediately. Administer oxygen or artificial

respiration as needed. Asthmatic symptoms may develop and may be immediate or delayed up to several hours.

Ingestion: If the product is swallowed, do NOT induce vomiting. Wash mouth out with water. Do not give

anything by mouth to an unconscious person. Get medical attention.

Notes to Physician: Eyes: Stain for evidence of corneal injury. If cornea is burned, instill antibiotic/steroid

preparation as needed. Workplace vapors could produce reversible corneal epithelial edema impairing vision.

Skin: This compound is a skin sensitizer. Treat symptomatically as for contact dermatitis or thermal burn.

Ingestion: Treat symptomatically. There is no specific antidote. Inducing vomiting is contraindicated because of

the irritating nature of the compound. Inhalation: Treatment is essentially symptomatic. An individual having a

dermal or pulmonary sensitization reaction to this material should be removed from further exposure to any


Section 5 - Fire-Fighting Measures

Extinguishing Media: Dry chemical, carbon dioxide or foam. Water spray for large fires and to cool containers.

Special Fire Fighting Procedures: Decontaminate equipment and protective clothing prior to reuse. During a

fire, isocyanate vapors and other irritating, highly toxic gases may be generated by thermal decomposition or

combustion. Exposure to heated diisocyanate can be extremely dangerous.

Unusual Fire And Explosion Hazards: Closed container may forcibly rupture under extreme heat or when

contents are contaminated with water (CO2 formed). Use cold-water spray to cool fire-exposed containers to

minimize the risk of rupture.

Hazardous Decomposition Products from Fire and High Heat: Carbon dioxide (CO2), carbon monoxide

(CO), oxides of nitrogen (NOx), dense black smoke., Isocyanate, Isocyanic Acid.

Section 6 - Accidental Release Measures

Steps To Be Taken If Material Is Released Or Spilled: Wipe up spills with rags or towels. Spilled material will

quickly begin to harden and adhere to almost anything.

Section 7 - Handling and Storage

Store and use at temperatures between 64° and 104° F. Thickness of the product slows solvent evaporation, but

vapors in the work area can still become explosive at or above the flash point of 79º F. Do not use near flame,

sparks or electric motors. In dryer climates use caution against static discharge igniting vapors by grounding and

bonding can and work. The safest place to work is outdoors if possible. Self life of unopened product is

guaranteed to be 6 months from date on lid. Unopened product may still be good for up to 2 years. Opened and

resealed cans may harden in a few weeks or months. Humidity hastens hardening. The lid on resealed cans may

pop off with near explosive force at any time, depending on the amount of moisture that was absorbed by the

product while the lid was off. Use caution and eye protection when handling or opening resealed cans.

Section 8 - Exposure Controls / Personal Protection

Ingredient C.A.S. No. Concentrati

on TWA(source) STEL Ceiling

Polyisocyanate Prepolymer

based on MDI Trade secret* 51% 0.02 ppm(1)

0.005 ppm(3) - -

m-Xylene 108-38-3 10% 100 ppm(1,2,3,4) 150 ppm(2,3,4) -


Diisocyanate (MDI) 101-68-8 10% 0.005 ppm(2,3,4) - 0.02


RW0126 Exo-Coat Page 3 of 4 2/8/16

Ingredient C.A.S. No. Concentrati

on TWA(source) STEL Ceiling


acetate 108-65-6 5% 50 ppm (AIHA WEEL) - -

p-Xylene 106-42-3 4% 100 ppm(1,2,3,4) 150 ppm(2,3,4) -

Ethylbenzene 100-41-4 4% 100 ppm(1,2,3,4) 125 ppm(2,3,4)



Diisocyanate (pMDI)

9016-87-9 3% 0.005 ppm(4) - 0.02


o-Xylene 95-47-6 3% 100 ppm(1,2,3,4) 150 ppm(2,3,4) -

Carbon black (bound in

liquid mixture) 1333-86-4 3% Only limits for airborne, unbound particles of

respirable size are known. This form is not respirable.

Polyethylene 9002-88-4 2% No published limits are known.


Diisocyanate (MDI) Mixed


26447-40-5 2% No published limits are known.

Solvent naphtha

(petroleum), medium


64742-88-7 2% No published limits are known.

Toluene 108-88-3 0.11% 50 ppm(3), 100ppm(2,4)

200 ppm(1)

150 ppm(2,4),

300 ppm(1) 500 ppm(1)

(1)=OSHA (2)=NIOSH (3)=ACGIH (4)=CANADA TWA=8 hour Time Weighted Average STEL=15 minute TWA Ceiling=Instantaneous

Ingredients not shown either have no known limits or are below reportable levels in section 3 above.

Ventilation: None required when used as directed. When used as directed a change of room air of 4 times per

hour should be adequate.

Respiratory Protection: None expected when used with plenty of ventilation. In enclosed spaces or if the above

exposure limits will be exceeded wear a NIOSH approved respirator with an organic vapor cartridge.

Gloves: Wear resistant gloves such as neoprene, Nitrile or PVC. Do not use disposable latex. Disposable Nitrile

are fine.

Eye Protection: If eye contact through splattering is possible, wear safety glasses with side shields.

Other Protective Equipment: Use a rubber or plastic apron or other protective clothing to prevent contact with

clothing. Product will not wash out of clothing. Removal of dried product may be possible with acetone or methyl

ethyl ketone if they do not harm to underlying material.

Section 9 - Physical and Chemical Properties

Appearance and Odor: A black liquid with a sweet, solvent-like odor.

Odor Threshold: Not Available Vapor Pressure: 6.5 mmHg @ 68 °F.

pH: Not Applicable Vapor Density: 3.7 (Air = 1.0)

Melting Point: Not Available Relative Density (Specific Gravity): 1.045

Freezing Point: Not Available Solubility(ies): Water: Insoluble Toluene: 100%

Boiling Point, Initial: 281° F. Partition coefficient: Not Available

Boiling Range: Not Available Auto-ignition Temperature: Not Available

Flash Point: 79° F. (ASTM D-56 closed cup) Decomposition Temperature: Not Available

Evaporation Rate: 0.6 (1=N-Butyl Acetate) Viscosity: Same as water.-

Flammability: (solid, gas): Not Applicable Volatiles Percent: 27%

Upper Explosive Limit: 1.1% V.O.C.: 20% - 108 grams/liter

Lower Explosive Limit: 6.6%

Section 10 - Stability and Reactivity

Incompatibility: Oxidizers. Hazardous Decomposition Products: None

Section 11 - Toxicological Information

Primary Routes of Entry: X Skin contact; X Skin absorption; X Inhalation; X Ingestion

Potential Health Effects:

Eyes - causes severe irritation, redness, tearing and blurred vision.

Skin - may cause irritation. Repeated contact may cause dermatitis and sensitization on persons with sensitive


Swallowing - results in irritation of mucous membranes, nausea, vomiting and diarrhea.

Breathing - excessive breathing of vapors may cause irritation, sensitization, central nervous system damage,

kidney or lung damage and in very extreme cases of over-exposure unconsciousness or death.

RW0126 Exo-Coat Page 4 of 4 2/8/16


None of the ingredients have a higher level of concern than the following:

IARC 3 - “Unclassifiable as to carcinogenicity to humans”, on a scale where 1 is a “human carcinogen”, 2A is

“probably a human carcinogen”, 2B is “possibly a human carcinogen”, and 4 is “probably not a human


ACGIH A4 - “Not classifiable as a human carcinogen”, on a scale where A1 is a “confirmed human carcinogen”,

A2 is a “suspected human carcinogen”, A3 is a “confirmed animal carcinogen with unknown relevance to

humans” and A5 is “not suspected as a human carcinogen”.

None of the ingredients are listed as carcinogens by OSHA or NTP.

Section 12 - Ecological Information

Do not dispose of in the environment. High toxicity to aquatic life. Once hardened it is basically inert.

Section 13 - Disposal Considerations

Waste Disposal Method: Until the product dries the material is combustible. Once dry, product, rags and towels

may be disposed of safely in regular trash.

Section 14 - Transport Information

D.O.T. Hazard Class: Gallons and larger - PAINT, 3, UN 1263, P.G. II. Quarts and smaller - ORM-D.

Section 15 - Regulatory Information

The components of this product are on the TSCA inventory of chemical substances.

Section 313 Supplier Notification: This product contains the following toxic chemicals subject to the reporting

requirements of Section 313 of the Emergency Planning and Community Right-to-Know Act of 1986 and CFR 372.

Chemical Name C.A.S. No. % By Weight Lbs./Gallon

4,4'-Diphenylmethane Diisocyanate 101-68-8 9.9% 0.78

Ethylbenzene 100-41-4 4.2% 0.34

Polymeric Diphenylmethane Diisocyanate 9016-87-9 3.3% 0.26

m-Xylene 108-38-3 10.2% 0.81

o-Xylene 95-47-6 3.2% 0.23

p-Xylene 106-42-3 4.4% 0.35

Toluene 108-88-3 0.1% 0.009

California Proposition 65 Notification: This product contains chemicals known to the state of California to

cause cancer.

Chemical Name C.A.S. No. % By Weight

Ethylbenzene 100-41-4 4.2%

Toluene 108-88-3 0.111%

Section 16 - Other Information

NFPA: H:3 F:2 I:0 HMIS® III: H:2 F:2 P:0 These ratings estimates are to be used only with a fully

implemented training program in the workplace. NFPA® is a mark registered by the NFPA. HMIS® is a mark registered by the NPCA.

Replaces sheet dated 2/26/11. GHS changes made.

The information accumulated herein is believed to be accurate but is not warranted to be. Recipients are advised

to confirm in advance that the information is current, applicable, and suitable to their circumstances.

Please call in to complete transaction 510-282-5734

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