Choosing the right coating for an aging metal roof can improve waterproofing, reduce heat gain, and extend the roof’s life. The following selections are elastomeric and rubberized coatings that adhere well to metal, resist cracking, and offer reflective or UV-stable properties. This guide highlights five options with varied coverage, durability, and temperature performance to help homeowners evaluate the best fit for their climate and roofing needs.
- Product Snapshot: Rust-Oleum 710 Elastomeric Roof Coating (5 Gallon, White) — waterproof seal in hours, 10-year warranty, cool roof reflectivity
- Gardner Sta-kool Elastomeric Roof Coating (White, 5 Gallon) — siliconized white coating with strong adhesion
- AMES MSS1 Maximum Stretch Roof Coating (1 Gallon) — high elongation, reflective white finish
- Liquid Rubber Waterproof Sealant (1 Gallon) — industrial-strength bitumen formula with over 950% elongation
- Rust-Oleum 510 Fibered Aluminum Roof Coating (5 Gallon) — rustproof metal roof protection with reflectivity
Rust-Oleum 710 Elastomeric Roof Coating, 5 Gallon, White
Rust-Oleum 710 Elastomeric Roof Coating provides a flexible, waterproof seal that cures within hours. This 5-gallon white coating is designed for metal roofs and offers a 10-year warranty, which signals durability in aging roof systems. The formulation emphasizes energy savings through Cool Roof Technology and 80% reflectivity, helping to lower attic temperatures and potentially reduce cooling costs. It adheres well to metal substrates and resists cracking as the roof expands and contracts with temperature swings.
Gardner Sta-kool Elastomeric Roof Coating, White, RV Roof Coating 5 Gallon
Gardner Sta-kool is a siliconized white elastomeric roof coating designed for durable metal and RV roofs. The 5-gallon format suits larger projects or multiple roof sections. Its silicone-like properties help resist weathering, UV exposure, and temperature-related cracking. The white finish enhances solar reflectivity, contributing to energy efficiency. Applicators can expect good adhesion on metal surfaces and a flexible layer that moves with the roof without cracking in normal climate cycles.
AMES RESEARCH LABORATORIES MSS1 Maximum Stretch Roof Coating, 1 Gallon, White
AMES MSS1 Maximum-Stretch is a white, elastomeric, acrylic roof coating with up to 650% elongation. This high stretch capacity helps block cracking and peeling on metal roofs that experience movement. It reflects about 88% of sunlight, contributing to lower surface temperatures and potential cooling savings. The coating adheres to metal roofing and can be brushed, rolled, or sprayed on. It functions as both a roof sealant and protective membrane, suitable for low-slope metals and related roof surfaces.
Rust-Oleum 510 Fibered Aluminum Roof Coating, 5 Gallon
Rust-Oleum 510 Fibered Aluminum Roof Coating provides rustproof protection for metal roofs with a fibered aluminum backbone. The 7-year warranty indicates confidence in long-term durability under metal roof exposure. The coating embodies Cool Roof Technology with about 53% reflectivity to help reduce heat buildup in the attic and living spaces beneath the roof. The formula is designed for metal substrates and offers robust resistance to weathering, moisture, and temperature changes over time.
Liquid Rubber Waterproof Sealant – 1 Gallon (Black)
Liquid Rubber Waterproof Sealant uses an industrial-strength bitumen formula to form a seamless waterproof membrane for flat and low-slope roofs, including metal surfaces. With over 950% elongation, it remains flexible under building movement and temperature shifts. The product is suitable for horizontal roofs and vertical surfaces like foundations for waterproofing. Coverage varies with application thickness, and multiple coats are often required to achieve the intended membrane thickness. It is a versatile option for preventative maintenance and repair projects.
Buying Guide
Key considerations when selecting a coating for an old metal roof include substrate compatibility, expected movement, climate, and sunlight exposure.
- Flexibility and elongation: For aging metal roofs that experience expansion and contraction, look for high elongation ratings to prevent cracking.
- Reflectivity and energy savings: Light-colored or reflective coatings help reduce cooling loads in hot climates.
- Adhesion and substrate compatibility: Ensure the coating adheres well to metal, with guidance for flat or corrugated surfaces.
- Durability and warranty: A longer warranty can indicate durable protection, especially on roofs with preexisting corrosion.
- Application method and coverage: Consider whether you will brush, roll, or spray; verify the recommended coverage per gallon for your roof area.
- UV resistance and weather exposure: UV-stable formulas resist degradation, preserving membrane integrity over time.
Product diversity provides options across goals like maximum stretch, aluminum reflectivity, or ultra-solid waterproofing. Homeowners should balance cost, climate demands, and the condition of the existing roof when choosing the best coating.
Comparison Snapshot
| Product | Type | Surface | Key Benefit | Approximate Reflectivity |
|---|---|---|---|---|
| Rust-Oleum 710 Elastomeric Roof Coating | Elastomeric | Metal | 10-year warranty; fast cure | 80% |
| Gardner Sta-kool Elastomeric Roof Coating | Elastomeric | White metal/RV roofs | Siliconized formula; durable | High reflectivity |
| AMES MSS1 Maximum Stretch Roof Coating | Elastomeric | Metal roofs | 650% elongation; strong crack resistance | 88% |
| Liquid Rubber Waterproof Sealant (1 gal) | Rubberized sealant | Flat/low-slope metal roofs | Over 950% elongation; flexible | Low reflectivity |
| Rust-Oleum 510 Fibered Aluminum Roof Coating | Fibered aluminum | Metal | Rustproof protection; 53% reflectivity | Moderate |