Time and exposure to the sun and elements of nature take their toll on outdoor equipment like an outdoor tank. So when you finally decide to repaint it you want it to last as long as possible before you will have to do work on it again.
When it comes to choosing the best paint for your outdoor fuel tank, you’ll want to consider the material that the tank is made from. Fuel tanks can be made from a variety of materials, including metal, plastic, and fiberglass.
Check the tank manufacturer’s maintenance instructions first. This article concerns exterior coatings only. It is not a procedure for entering, draining, purging, repairing or relining a tank, and it does not establish that a rusty tank is serviceable.
If your tank is made from metal, you’ll want to choose a paint that can withstand exposure to the sun and weather conditions.
Use an exterior coating system approved for the exact tank and existing finish. There is no universal polyurethane or acrylic/urethane recommendation for every metal fuel tank.
A polyurethane paint has good elongation properties to flex with the substrate while maintaining the material’s color. It can tolerate the wet and dry conditions of being outdoors, is UV and chemical-resistant and extremely resistant to scratching and chipping.
If your tank is made from plastic or fiberglass, you’ll want to choose a paint that can resist fading and chipping in the sun and rain.
Do not assume a plastic or fiberglass fuel tank can be painted with house paint. Confirm whether coating is permitted and which preparation, color and coating system the manufacturer allows.
If the manufacturer does not provide a compatible coating procedure, ask before proceeding. Flexibility and UV-resistance claims alone do not establish suitability for the tank material.
Coating Names to Check With the Manufacturer
The products below are not verified approvals for your tank. Ask the tank and coating manufacturers to confirm compatibility and application requirements. For 2K systems, assess the hardener and application hazards as well.
1. Rust-Oleum's 9800 DTM Urethane Mastic
- Type: 2K acrylic polyurethane
- Key Feature: Direct-to-metal application with minimal surface prep
- Durability: Extremely durable, high-solids and high-build formula
- Best For: Tanks, towers, equipment in moderate to severe environments
- Price: Check current pricing
- View on Walmart
2. Craftsman Metal Antirust Coating
- Type: Polyurethane-enhanced DTM coating
- Key Feature: No primer needed - single coat application
- Protection: UV resistant, all-weather protection
- Versatility: Suitable for both indoor and outdoor use
- Price: Around $69.99
- View on Amazon
What is polyurethane?
Polyurethane is actually a type of plastic that is used in various types of objects because it is sturdy, flexible and durable. It’s the material of choice for a broad range of end-user applications such as:
- paint
- insulation
- car parts
- tires
- foam products
- footwear
…and so on.
It was invented in the 1930s by Professor Dr. Otto Bayer and got widespread use during World War II when it was utilized as a replacement for rubber.
In the coming decades there were many developments and today we are surrounded by polyurethane applications in every aspect of our everyday lives. While polyurethane is a product that most people are not very familiar with, since it’s generally “hidden” behind covers or surfaces made of other materials, it would be hard to imagine life without it.
What color should I paint my outside fuel tank?
Outdoor fuel tanks are often painted in white, silver or light grey because of their characteristics to reflect the sunshine and minimize heat.
More heat energy causes more and faster chemical oxidation reactions, which lead to fuel degradation.
Do not assume a particular fuel-saving percentage from repainting. This article has no verified measurement supporting that claim.
Follow the identification and color requirements for the tank and stored fuel. Do not choose vivid decorative colors or cover labels as a substitute for proper identification.
How do you paint a rusty fuel tank?
Have corrosion assessed before preparation. Paint cannot repair metal loss, and wet sanding does not establish that work around fuel vapor is safe.
Have a qualified tank service provider assess rust, pitting, staining or suspected leakage first. Do not use heat, grinding or abrasive blasting as DIY preparation, and do not treat an empty tank as vapor-free.
For a serviceable tank, follow its manufacturer’s exterior maintenance procedure and the compatible coating system. A general metal-preparation chemical is not automatically suitable for its shell, fittings or existing finish.
Apply only the agreed coating system to permitted exterior surfaces. Keep vents, gauges, fittings, warning labels and identification plates clear and functional.
POR-15 is a high-performance rust-preventive coating specifically designed for application on rusted or seasoned metal surfaces.
It stands out from traditional paints due to its unique curing process, which draws moisture from the atmosphere rather than relying on solvent evaporation.
This results in a rock-hard, non-porous finish that effectively prevents rust by blocking moisture and oxygen from reaching the metal surface.
The primer needs to be painted with a top coat since it’s not UV-resistant Photo: POR15.com
Use the primer and topcoat manufacturer’s specified recoat window and preparation. Dry-to-touch alone does not establish readiness for a different coating.
Use the stated coat count and intervals for the selected system; there is no universal 24-hour second-coat rule.
Recommended Preparation Products
These examples are not an instruction to strip, scrape or chemically prepare a fuel tank. Use them only if the tank’s maintenance procedure and compatible coating system call for them.
1. POR-15 Rust Preventive Coating
- Type: High-performance rust-preventive primer
- Finish: Semi-gloss black
- Size: 32 fluid ounces
- Price: Around $80.70
- View on Amazon
2. Oil Eater Original Cleaner and Degreaser
- Type: All-purpose cleaner and degreaser
- Size: 32 oz bottles (Pack of 2)
- Use: Dissolves grease and oil stains
- Price: Around $13.75
- View on Amazon
3. Heavy Duty Wire Brush Set
- Type: Stainless steel wire brush
- Handle: 10″ curved beechwood handle
- Quantity: 2 pieces
- Price: Around $11.39
- View on Amazon
How do I protect my fuel tank from rusting?
Follow the tank manufacturer’s inspection and maintenance schedule. Granby’s guidance, for example, calls for annual inspection and servicing and directs owners to the particular tank’s maintenance instructions.
The vegetation will cause a layer of algae to form on the tank which will attract moisture which will cause corrosion to form more easily.
Fading or loss of gloss alone does not determine the tank’s condition. Ask the service provider whether the coating needs maintenance and whether corrosion or other defects require action.
Another sign can be when you see small bubbles, meaning that rust has started to form beneath the paint.
Do not scrape suspected corrosion to see how deep it goes. Have the condition assessed and follow the resulting maintenance or replacement advice.
Conclusion
An appropriate exterior coating can support maintenance, but cannot guarantee that a fuel tank is free from corrosion, leakage or other problems.
Do not wrap a tank in a tarp or fit a cover without manufacturer approval. Access, inspection and the proper operation of vents and fittings must be maintained.
A cover is not a substitute for inspection and maintenance. Follow the requirements for the particular tank and installation.
I hope this article has clarified and helped you with your questions on what is the best paint for outside fuel tanks.
Related Videos
A general video about rusty metal is not a fuel-tank maintenance procedure. Use the tank manufacturer’s instructions and qualified service advice.
Sources and Scope
Safety wording corrected on 17 October 2026. Product listings remain subject to tank-specific verification.
- Granby: painting and maintenance questions
- Granby: tank-specific manuals
- OSHA: vapor and ignition hazards around tanks — workplace guidance, not a homeowner work procedure
