United Coatings Elastuff® 101 Base Roof Coating


Elastuff 101 & Elastuff 103 is a high solids, moisturecatalyzed, single-component polyurethane coating system. The system consists of Elastuff 101, an aromatic polyurethane basecoat, and Elastuff103, a UV-resistant, color stable aliphatic polyurethane topcoat. Elastuff 103 is a low VOC aliphatic topcoat available to meet VOC regulations in specific areas. This combination provides an excellent balance of tensile strength, elongation and hardness, resulting in superior durability, dirt and mildew resistance, chemical resistance and weatherproofing. High abrasion and impact resistance also offer protection from maintenance traffic and severe weather conditions.

Elastuff 101 & Elastuff 103 system is a permanently flexible “breathing” membrane, allowing moisture vapor to pass through the film while preventing water infiltration.

Sizes Available:

1 gallon bucket
5 gallon (19 liter) pail
50 gallon (189 liter) drum

Colors Available:

Light Gray


The Elastuff 101 & Elastuff 103 System is designed for protecting a wide range of substrates from the effects of weathering and moisture intrusion. It is particularly effective as a protective membrane over new or existing roof substrates, including concrete, metal, polyurethane foam, and asphaltic substrates. It provides a barrier to the effects of degradation caused by normal weathering, aging, and ultraviolet exposure.

Elastuff 101 & Elastuff 103 is also effective when used on other horizontal or vertical applications requiring a tough, abrasion, and chemical-resistant membrane, such as secondary containment and hot or ambient storage tanks.

The Elastuff System also achieves excellent adhesion to primed concrete, masonry, metal and wood surfaces. Elastuff103 is very effective when used on its own in a wide variety of applications requiring a tough, abrasion resistant finish.

Elastuff 101 and Elastuff 103 are single-component elastomers that are catalyzed through exposure to moisture in the air. They are designed for application through standard airless spray equipment.

Elastuff 101 is available in standard Light Gray only. Elastuff 103 is available in standard White, which is certified to meet ENERGY STAR®, Cool Roof Rating Council (CRRC) and LEED reflectance and emissivity criteria, as well as California Title 24 requirements.

Physical Properties

Solids By Weight 82% (±2) [ASTM D2369]
Solids by Volume 80% (±2) [ASTM D2697]
Flash Point 75°F (24°C) [ASTM D3278]
Dry Time
to Walk On
Basecoat: 6-8 hours @ 24 wet mils
Dry Times at 70°F (21°C), 50% RH
Tensile Strength 1,000 psi (±100) [ASTM D412]
Elongation 500% (±50) [ASTM D412]
Tear Strength 125 lbs. per inch (±20) [ASTM D1004]
Hardness 65–70 Shore A [ASTM D2240]
VOC < 250 g />L

Abrasion Resistance Less than 35 milligrams weight loss
using CS-17 abrasive wheels and 1000
gram weights after 1000 cycles on
Taber Abraser. [ASTM D4060]
High Temperature
Tested in thermostatically controlled
heat chamber. Will not age harden or
slump at temperatures up to 200°F
(93°C). [ASTM D794]
Low Temperature
Impact Resistance
No surface cracks or breaks when
impacted with 4.6 oz (130 gram), 1¼”
(3.18 cm) steel ball dropped from a
height of 5’ (1.5 m) at -12°F (-25°C).
Temperature Limits
For Normal
Service Conditions
Tested from -30°F to 200°F
(-34°C to 93°C).
Fire Resistance UL-790 Class “A” listed system. Consult
UL Building Material Directory
Ponded Water
5” (12.7 cm) column of water over
polyurethane foam coated with the
Elastuff 101 & Elastuff 103 system. No significant loss of adhesion after 30
days of continuous testing. No blistering
or other deleterious effects. No
migration of water into the substrate.
Standard Colors Elastuff 101 is available
in standard Light Gray only.
Elastuff 103 is available
in standard White.

Properties & Advantages

Resistance to Accelerated Weathering: Test panels were placed in the QUV Accelerated Weathering Tester. Cycling is set at 4 hours of ultraviolet radiation, during which time temperatures reach approximately 135°F (57°C), and 4 hours with no U.V. radiation. A water bath at the bottom of the unit is maintained at 100°F (38°C) to create a constant high humidity condition. After 3,000 hours of continuous testing, the Elastuff 101 & Elastuff 103 system showed no surface checking or cracking, no delamination, no loss of flexibility and no chalking. Tested in accordance with ASTM G53.

Resistance to Freeze-Thaw: Elastuff 101 & Elastuff 103 test panels were exposed to freeze-thaw cycles under complete immersion in deionized water. Cycles consisted of 16 hours at 0°F (-18°C) and 8 hours at 70°F (21°C). After 4 complete cycles, the physical integrity of the coating remained unaffected. There was no loss of adhesion, and no blistering or softening.

Water Absorption: 3” (7.5 cm) free film discs were immersed in deionized water at 70°F (21°C). After 7 days immersion, Elastuff 101 showed less than 1% weight gain, while Elastuff

103 showed less than 2.5% weight gain. No visual effect was observed and all elastomeric propertieswere retained. Tested in accordance with ASTM D543.

Resistance to Salt Spray: Coated polyurethane foam test panels were placed in the Harshaw Salt Spray Cabinet and maintained at a temperature of 95°F (35°C), utilizing a fog solution of not less than 5% sodium chloride by weight. After 500 hours of continuous testing, the Elastuff 101 & Elastuff 103 system had no loss of adhesion, no blistering or softening and no loss of flexibility. ASTM B 117.

Bond Strength: Instron Universal Testing Instrument—50 to 60 lbs./in² (0.34–0.41 MPa) breaking strength. There was no adhesive failure between the Elastuff 101 coating and the polyurethane foam substrate. Elastuff 101 remained totally bonded to the polyurethane foam under all stress conditions. Breaking point occurred within the polyurethane foam itself. ASTM C297.

Impact Resistance: Steel Ball Drop Procedure using a 12 ounce (340 gram), 1¾” diameter (4.45 cm) steel ball dropped from a height of 20 ft (6.1 m) onto 2.7 lb/ ft³ polyurethane foam coated with the Elastuff 101 & Elastuff 103 system. No surface cracks or breaks were observed in the coating. Test is adapted from National Bureau of Standards “Falling Hailstone Test”.


All documents are U.S. English unless otherwise noted

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