Ure-A-Max Eco

Ure-A-Max Eco is the low-VOC hybrid urethane roof restoration system from American WeatherStar. It is classed as a commercial roof coating system for commercial roof restoration on flat roofs. A dark gray Aromatic Urethane 512-CA base coat is paired with a white Aliphatic Urethane 510-CA top coat, and flashing details are waterproofed with Urethane Brush-Grade 524-CA. The system meets SCAQMD VOC requirements.

Suitable substrates are spray polyurethane foam, modified bitumen, built-up roofs, single-ply (TPO, PVC), EPDM and structural concrete. The membrane is used for full roof coatings, spot repairs and reinforcement of flashings. Application guidelines exist for single-ply, EPDM, modified bitumen, built-up roofing and concrete, each 5 pages and last revised 05/27/25.

1. Existing roof substrate, pressure washed to remove dirt, dust, debris and other contaminants.
2. Waterproofing details: Urethane Brush-Grade 524-CA on all seams, transitions, penetrations, drains and other flashing details.
3. Base coat of Aromatic Urethane 512-CA.
4. Top coat of Aliphatic Urethane 510-CA.

The system graphic marks terms of 10, 15 and 20 years. A surface temperature comparison is also marked on the brochure for before, during and after coating.

Aromatic Urethane 512-CA is a high-solids, single-component, moisture-cure polyurethane base coat for EPDM, TPO, PVC, modified bitumen and BUR surfaces. It was developed as the base coat for the Ure-A-Sil system and can also sit under Aliphatic Urethane 510. It must be top coated, with Silicone 410, High Solids Silicone 412 or Aliphatic Urethane 510. Published data:

• Solids by volume: 77 percent
• Elongation: 375 percent; tensile strength 1,000 psi
• Viscosity: 6,000 cps
• Weight: 11.7 lbs per gallon
• Flash point: 78 degrees F
• Hardness: 50 to 55, Shore A
• Water absorption: below 3 percent
• Dry times: dry to touch 6 hours, tack-free 8 to 12 hours, recoat 12 to 16 hours
• Service range: -50 to 200 degrees F
• Shelf life: 6 months
• Clean up: acetone

The color is dark gray, supplied in 5 gallon and 55 gallon sizes. It is applied by medium nap roller, soft brush or conventional airless spray, and top coats or intermediate coats must go on within 48 hours. Minimum application temperature is 40 degrees F, and storage is recommended at 75 degrees F.

Aliphatic Urethane 510-CA is a high-solids, single-component, moisture-cure aliphatic polyurethane. In this system it is the UV-stable top coat. Published data:

• Solids by volume: 76.7 percent (ASTM D5201)
• Elongation: 230 percent; tensile strength 2,300 psi
• Viscosity: 100 KU
• Weight: 10.77 lbs per gallon
• Hardness: 85, Shore A; permeability 0.9 perms; water absorption below 2 percent
• Flash point: 93 degrees F
• Dry times: to touch 6 hours, tack-free 12 to 16 hours, recoat 18 hours
• Service range: -50 to 200 degrees F; shelf life 1 year

The color is white in 5 gallon packaging, and the coating cleans up with acetone. It is applied with rollers, soft brushes or airless spray, and is not applied below 40 degrees F. The lower vapor permeability gives more resistance to moisture penetration, and moisture cure widens the production window.

Urethane Brush-Grade 524-CA is a high-solids, single-component aliphatic polyurethane for flashing and detail work. It is white, with 76.7 percent solids by volume, 230 percent elongation, 2,300 psi tensile strength, viscosity of 100 KU and VOC below 50 g/L. It weighs 10.49 to 10.89 lbs per gallon, dries in 12 hours at 77 degrees F and 50 percent relative humidity, has a 1 year shelf life, cleans up with acetone and is packed in 3 gallon sizes.

It is applied by heavy brush as received. Thinning up to 10 percent by volume with acetone is permitted if viscosity increases. Substrate temperature must be above 40 degrees F and below 100 degrees F, more than 5 degrees F above the dew point and rising. It reflects 80 percent of solar rays and is suitable for EPDM, single-ply membranes, concrete, modified bitumen, metal and polyurethane foam.

The guidelines list these values for the three urethanes:

• Aliphatic Urethane 510-CA: single-component moisture-cure urethane, viscosity 100 KU, elongation 230 percent, tensile strength 2,300 psi, 76.7 percent solids, bright white over single-ply and EPDM.
• Aromatic Urethane 512-CA: viscosity 6,000 cps, elongation 375 percent, tensile strength 1,000 psi, 77 percent solids, dark gray.
• Urethane Brush-Grade 524-CA: viscosity 100 KU, elongation 230 percent, tensile strength 2,300 psi, 76.7 percent solids, white.

Spunbound polyester fabric, with 35 psi tensile strength, is available for reinforcement. EcoCleaner 925, a clear cleaner at 0 g/liter VOC, is used where needed to remove contaminants. It is diluted 5:1, applied at 1 gallon per 150 square feet and followed by washing at a minimum of 3,000 psi with a complete rinse.

• Surfaces are cleaned of dirt, dust, delaminating coatings and waste products such as oil, oil-based roof cements, solvents, grease and animal fats.
• Adhesion to single-ply and EPDM depends on the age and condition of each roof and, for single-ply, on the membrane type. Field adhesion tests are highly recommended.
• On concrete, the guideline covers structural concrete deck roofs and other concrete surfaces.

American WeatherStar warrants that supplied material meets or exceeds published physical properties, and the contractor guarantees workmanship. American WeatherStar approves each job before it starts, and a Pre-Project Inspection Report is filed and approved beforehand.

Hybrid urethane coatings on low-slope roofs belong with flat roof waterproofing.