Use and Care Manual

330 Central Ave. I Clark, NJ 07066 I 800.526.4236 I Fax [phone] | www.karnakcorp.com
Updated: 06.18.21
ROOFING
505HS Mohave Coat
*Read Safety Data Sheet before using this product.*
DESCRIPTION: 505HS Mohave Coat is a premium, high solids, acrylic co-polymer elastomeric roof
coating. 505HS Mohave Coat provides excellent protection, appearance, mildew resistance, color
stability, weather ability and flexibility.
USES: 505HS Mohave Coat is designed to be applied directly over built-up asphalt roof surfaces
that have aged a minimum of 90 days, SBS and APP granular modified membranes and smooth
surface APP membranes that have weathered a minimum of 30 days as well as metal roofs and
SPF foam systems. Also for use on above grade vertical surfaces such as concrete, concrete block,
brick, stucco, metal and wood. May also be used for application over applicable base coats 404
Corrosion Proof Base Coat, 405 Bond-N-Shield, 406 Tru-Grip, and 407 EPDM & SPF Base Coat.
SURFACE PREPARATIONS: Surfaces to be coated should be dry, clean, free of dirt, dust, grease, oil
and loose paint. Recommended application temperature is 40°F to 120°F. Power wash surfaces
with 799 Wash-N-Prep and water. Wash roof surfaces with a minimum of 2000 psi. taking all
necessary precautions to avoid damage to the roof system. Patch and repair cracks or holes with
appropriate sealants or caulking materials. All wet insulation should be removed and replaced with
like materials. New BUR roof surfaces must age a minimum of 90 days before coating. Newly
installed cold-process, hot-applied and torched-applied modified bitumen membranes should age
30 days before coating. Allow fresh masonry to cure a minimum of 30 days before application.
505HS Mohave Coat or subsequent base coats should be dry prior to application of a finish coat of
505HS Mohave Coat. .
APPLICATION: Recommended use is for application over one of KARNAK’s 400 series substrate
specific base coats. Mix lightly prior to application of the coating. 505HS Mohave Coat may be
applied by brush, spray equipment or roller. Allow first coat to dry 8 to 12 hours before application
of the second coat. Apply when temperatures are 40ºF and rising but not over 120ºF. Do not apply
when rain is expected during or within 24 hours after application. For applications in higher
temperatures (above 90 °F) KARNAK recommends application in multiple thin coats to prevent
trapped moisture problems. Commencement of work by the contractor implies his approval of the
deck surface.
ROLLER / BRUSH APPLICATION: Apply with a 3/4" – 1-1/4” nap roller or soft roof brush
perpendicular to the first coat / base coat for proper protection.
SPRAY APPLICATION: Utilize a heavy-duty professional airless spray pump. Equipment
manufacturer should be consulted for more complete information. Spray application should be
done with a 50% over-spray pattern.
COVERAGE RATE: Apply in a single coat over applicable 400 series base coat at the rate of 1.5
gallons per 100 sq. ft. (24 wet mils) or apply direct to substrate in a two coat application at the rate
of 1.5 gallons per 100 sq. ft. per coat (Total of 3 gallons per 100 sq. ft.). This will achieve a dry mil
thickness of 20 to 24 mils. Coverage will vary depending on the surface to be coated.
COLORS: White, Desert Tan and Adobe Brown are standard colors. Other colors are available in
minimum quantities of 300 gallons. See “Elastomeric Coating Color Chart” for other available
colors.
CAUTION: Do not apply when rain is imminent. Protect from freezing. Coating must be dried
before exposure to water. Store in a heated room and keep container covered when not in use. Do
not thin. Keep out of reach of children. Avoid prolonged contact with skin. Dispose of in an
environmentally safe manner. Cover air intakes during application and while drying. For exterior
use only.
Cold-process systems and coatings, either emulsion or solvent-based, should only be installed on
decks with positive drainage. Per NRCA (National Roofing Contractors Association), “The criteria
for judging proper slope for drainage is that there be no evidence of standing water on a deck 48
hours after it stops raining.”
PACKAGING: Available in 5-gallon pails, 55-gallon drums, and 275-gallon totes.
If further information is needed, contact KARNAK Technical services at 800-526-4236.
PHYSICAL PROPERTIES &
SPECIFICATIONS
Weight per Gallon: 12 lbs.
Solids by Weight: 71%, Nominal
Solids by Volume: 57%, Nominal
Color: White, Desert Tan,
Adobe Brown
Hardness, Shore A: 75
Elongation: 210%, Nominal
ASTM D 2370
Tensile Strength: 275 PSI, Nominal
ASTM D2370
Permeability: 10 Perms
Cure Time: 24 to 48 hours@ 77°F
and 50% Relative
Humidity
Application Temp.: 40°F to 100°F
Service Temp
(Cured Film): -15°F to 180°F
VOC Content: 18 g/L MAX
ASTM D 6083 Type I
Solar Reflectance: 0.86 Initial
(White Only) 0.77 3-Yr. Aged
Thermal Emittance: 0.91 Initial
(White Only) 0.90 3-Yr. Aged
SRI: 109 Initial
(White Only) 96 3-Yr. Aged