Waterproofing metal surfaces is essential for preventing rust, corrosion, and structural damage. Whether you’re working on outdoor furniture, industrial machinery, or decorative fixtures, selecting the right waterproof paint can make all the difference in durability and performance. This guide showcases the 9 best waterproof paints for metal in 2025, including high-performance solutions like AY1280 Granite Protector.
Table of Contents
- Why Use Waterproof Paint for Metal?
- Factors to Consider When Choosing Waterproof Metal Paint
- Top 9 Waterproof Paints for Metal
- Summary Table: Best Waterproof Paints for Metal
- References
Why Use Waterproof Paint for Metal?
Metal surfaces are prone to rust, oxidation, and corrosion when exposed to moisture. Waterproof paint acts as a protective barrier that prevents water and contaminants from compromising the surface.
Benefits of Waterproof Metal Paint:
- Rust and corrosion prevention for longevity
- Improves surface appearance and color retention
- Ideal for outdoor and marine environments
- Reduces maintenance and repair costs
Factors to Consider When Choosing Waterproof Metal Paint
- Paint Type: Oil-based, epoxy, or acrylic
- Application Surface: Indoor, outdoor, marine, industrial
- Finish: Matte, gloss, or satin
- UV resistance: Especially important for exterior projects
- Drying time and recoating: Impacts convenience and scheduling
- Coverage area: Measured in m² per liter
Top 9 Waterproof Paints for Metal in 2025
1. AY1280 Granite Protector – Long-Lasting Waterproof & Antifouling Sealer
Brand: Aoyalis
This oil-based sealer is designed for granite but offers excellent adhesion and waterproofing on metal surfaces. Ideal for projects requiring both alkali resistance and long-term protection, it’s perfect for outdoor metal furniture or metal installations exposed to pollutants.
- 8–10 years of waterproof protection
- Blocks water infiltration and prevents corrosion
- Non-staining, color-preserving formula
- Available in 1L, 4L, 20L options
- Coverage: 10–15 m² per liter
2. Rust-Oleum 7701830 High-Performance Protective Enamel
A widely trusted name in waterproof and rust-preventative coatings, this oil-based formula is ideal for industrial, marine, and outdoor metal applications. The enamel delivers a hard, protective coating that resists abrasion, fading, and chipping.
- Excellent corrosion resistance
- Fast drying in 2-4 hours
- UV-resistant for long-term outdoor use
3. POR-15 Rust Preventive Coating
Perfect for metal restoration, this paint bonds tightly with rusted surfaces to form a waterproof and chemical-resistant seal. It’s commonly used in automotive and marine settings for its permanent rust sealing capabilities.
- High durability and heat resistance
- Stops rust on contact
- Requires topcoat if exposed to UV
4. Krylon Fusion All-In-One Spray Paint
A convenient aerosol option that delivers both paint and primer in one. It offers excellent adhesion to various surfaces including metal, without the need for sanding or priming.
- Waterproof and corrosion-resistant
- Fast-drying spray formula
- Available in multiple finishes
5. Zinsser Perma-White Exterior Paint
This mildew-proof paint is ideal for metal gutters, downspouts, and fences. It’s self-priming and forms a moisture-resistant coating that holds up against rain, snow, and humidity.
- Lifetime durability guarantee
- UV and fade-resistant formula
- Low-VOC and eco-friendly
6. Hammerite Direct to Rust Metal Paint
A three-in-one solution that acts as primer, undercoat, and topcoat. Its thick formulation provides superior rust blocking and waterproofing without requiring separate priming steps.
- Available in gloss, satin, and hammered finishes
- 8-year protection against rust
- Can be applied directly to rust
7. Jotun Hardtop XP Epoxy Paint
Designed for industrial and marine metal surfaces, this epoxy-polyurethane system provides exceptional durability, chemical resistance, and waterproof sealing.
- Used in shipping, oil & gas, and factory facilities
- Excellent UV stability
- High-gloss retention
8. Flex Seal Liquid Rubber Coating
A liquid rubber sealant that provides a thick, flexible waterproof barrier for metal roofs, tanks, and pipes. Once cured, it forms a weatherproof seal resistant to cracking and peeling.
- Brush, roll, dip, or pour application
- Works on wet or dry surfaces
- UV and chemical-resistant
9. BEHR Premium Direct-To-Metal Exterior Paint
This premium water-based acrylic paint provides excellent adhesion, rust resistance, and weatherproofing for metal doors, railings, and structural beams.
- Corrosion-inhibiting formula
- Available in multiple colors and finishes
- Fast drying and easy cleanup
Summary Table: Best Waterproof Paints for Metal
| Product | Base Type | Best For | Protection Duration | Special Features |
|---|---|---|---|---|
| AY1280 Granite Protector | Oil-Based | Granite/Metal outdoor use | 8–10 years | Alkali-resistant, antifouling |
| Rust-Oleum Protective Enamel | Oil-Based | Industrial & Marine | 5–7 years | UV & abrasion resistant |
| POR-15 Rust Coating | Solvent-Based | Rust sealing | Permanent (UV needs topcoat) | Heat resistant |
| Krylon Fusion All-In-One | Spray (Acrylic) | DIY metal projects | 3–5 years | No sanding/priming |
| Zinsser Perma-White | Water-Based | Outdoor furniture/gutters | 10+ years | Mold and mildew proof |
| Hammerite Metal Paint | Oil-Based | Direct to rust surfaces | 8 years | Primer + topcoat in one |
| Jotun Hardtop XP | Epoxy | Industrial/marine | 10+ years | Gloss retention, chemical resistance |
| Flex Seal Liquid | Liquid Rubber | Roofs, pipes, tanks | 5–10 years | Flexible, thick coat |
| BEHR Direct-To-Metal | Acrylic | Doors, railings | Up to 8 years | Fast drying, low odor |