Duro-Last Water-Based Adhesive User Manual
DURO-LAST® WB II ADHESIVE
DATA SHEET
Description:
Duro-Last® WB II Adhesive is a polymeric
waterborne adhesive used to bond both Duro-Last
membrane and Duro-Last Fleeceback membrane to a
variety of substrates on both horizontal and vertical
surfaces.
WB II Adhesive has VOC content less than 250 g/L
and meets all VOC restrictions and regulations in the
United States.
WB II adhesive may be used on the following
substrates after they have been properly prepared as
described in either the Duro-Last Adhered Fleeceback
Roofing System specification or the Adhered Systems
specification. The installing contractor is responsible
for following all applicable building, plumbing and
electrical codes.
Structural Concrete (poured in place or precast)
Wood (Plywood, OSB or Lumber)
Polyisocyanurate Rigid Insulation Board
DensDeck
DensDeck
SECUROCK
®
Prime Roof Board
®
Roof Board (not recommended)
®
Gypsum-Fiber Roof Board
Material Safety Data Sheet (MSDS):
Product Name: Duro-Last WB II Adhesive
Trade Name: Waterborne PVC Adhesive
MSDS Number / Product Code: FA636.
Precautions:
1. Review MSDS for safety information prior to use.
2. Combustible. Do not expose to heat, flame or
sparks. Do not smoke while applying.
3. Use only in well ventilated areas and avoid
breathing vapors.
4. Keep container closed when not in use.
5. When transferrin g adhesive between containers,
ensure that both containers are grounded.
6. Treat empty containers wit h cautio n since they may
contain flammable vapors.
7. Keep adhesive from freezin g.
8. The shelf life for an unopened container of this
adhesive, stored at temperatures between 60 °F
(16 °C) and 80 °F (27 °C) out of direct sunlight, is
1 year from the date of manufacture.
DURO-LAST WB II PHYSICAL PROPERTIES
Packaging 5 gallon pail
Weight 9 lb. / gallon 45 lb. / pail
Color White
VOC Content 179 g / L
Viscosity 10,000 – 16,000 cps
Total Solids 52% ± 3%
Open Time Up to 3 hours
Shelf Life 1 year, unopened
Coverage - Duro-Last Fleeceback Membrane
Roof Deck
Vertical
Applications
100-120 ft² / gallon
(500-600 ft² / pail)
Use Duro-Last Fleece Membrane Adhesive
0.8–1.0 gallon / 100 ft²
Not Applicable
Coverage - Duro-Last Membrane
Roof Deck
Vertical
Applications
140-180 ft² / gallon
(700-900 ft² / pail)
180 ft² / gallon
per surface for net
coverage of 90 ft²
0.55–0.7 gallon / 100 ft²
0.55 gallon / 100 ft²
per surface
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“Duro-Last” and “The World’s Best Roof” are registered marks owned by Duro-Last, Inc. Revised 1/21/2011
800-248-0280
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WB II ADHESIVE
Installation:
1. General
a. Read the MSDS prior to using the
adhesive.
b. Apply to surfaces which are clean,
smooth, dry and free of oil and grease.
c. Only apply adhesive when the ambient
temperature is at least 50 ºF (10 °C)
and rising.
d. Stir adhesive vigorously by hand to
achieve homogeneous mixture prior to
application.
e. Thinning the adhesive is not allowed.
2. Duro-Last Fleeceback Membrane
a. Using a 3/8 inch (medium) nap solvent
resistant roller apply evenly at a
coverage rate of 100-120 square feet per
gallon to the SUBSTRATE ONLY. The
coverage rate will vary depending upon
the porosity of the substrate. Do not
apply to non-porous substrates.
b. Do not apply adhesive where hot-air
welding will be performed.
c. Roll the membrane into the adhesive
IMMEDIATELY after it is applied. Do not
wait for the adhesive to dry. Fleeceback
membrane must be rolled into wet
adhesive.
d. Roll membrane onto the adhesive coated
substrate slowly and evenly to avoid
trapping air and to minimize wrinkles.
e. Apply pressure by means of a heavy
roller with a minimum weight of 150
pounds to ensure proper bonding.
f. For vertical applications use Duro-Last
Fleece membrane adhesive.
g. Refer to the Duro-Last Adhered
Fleeceback Roofing System specification
for guidelines regarding Fleeceback
membrane installation.
3. Duro-Last Membrane
a. Using a 3/8 inch (medium) nap solvent
resistant roller apply evenly at a
coverage rate of 140-180 square feet per
gallon to the SUBSTRATE ONLY. The
coverage rate will vary depending upon
the porosity of the substrate. Do not
apply to non-porous substrates.
b. Do not apply adhesive where hot-air
welding will be performed.
c. Adhesive should be wet or partially dried
to a "wet" surface tack prior to bonding
membrane. Dry time will vary according
to weather conditions.
d. Roll membrane onto the adhesive coated
substrate slowly and evenly to avoid
trapping air and to minimize wrinkles.
e. Apply pressure by means of a heavy
roller or push broom to ensure proper
bonding.
f. For vertical applications, apply adhesive
to BOTH the membrane and the
substrate at a rate of 180 square feet per
gallon (for a net coverage rate of 90
square feet per gallon). The coverage
rate will vary depending upon the
porosity of the substrate.
For porous substrates, such as
concrete block, apply an initial light
coating of adhesive as a seal coat.
Allow the seal coat to dry thoroughly
prior to adhesive application as
described above.
Allow adhesive to dry to "finger tack"
and then place membrane onto the
substrate.
Apply pressure to complete the bond.
g. Refer to the Duro-Last Adhered Systems
specification for guidelines regarding
membrane installation.
www.duro-last.com
“Duro-Last” and “The World’s Best Roof” are registered marks owned by Duro-Last, Inc.
800-248-0280
2 of 2
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