Karnak - 502MS Karna-Flex Sealant, 30oz. Tube

502MS Karna-Flex is an elastomeric, thermoplastic-rubber sealant formulated for use on built-up asphalt roofs, modified bitumen membranes and properly prepared metal, concrete, EPDM, TPO, and most PVC membrane as well as spray polyurethane foam and plywood roof substrates. Its ease of application, superior adhesion, elasticity and durability make 502MS Karna-Flex an ideal repair sealant. Available in a brush mastic or caulking cartridge.

Uses:

502MS Karna-Flex’s elastomeric properties make it an excellent sealant for built-up asphalt roofs, modified bitumen membranes as well as prepared metal, concrete, asphalt, spray polyurethane foam and plywood roof system details. Ideal for sealing and waterproofing cracks and splits on BUR and modified bitumen asphalt roofs, metal roof seams and splits, EPDM, TPO and PVC seams as well as gutters, fasteners, pinholes in metal, flashing and curb details. Also use to seal around skylights, penetrations and roof top equipment. May be applied to wet or dry surfaces. PVC and TPO roof surfaces should be at least 4 years old prior to application.

Advantages:

One component—no need to intermix with other materials
Easy application by brush or caulking gun
Superior film—forms a durable, weather resistant elastomeric membrane
Has superior adhesive and cohesive strength
Low temperature flexibility—specially selected polymers and resins impart superior low temperature properties to the coating
Adheres to wet or dry surfaces

Caution:

Do not use near open flame. Avoid breathing solvent fumes and prolonged contact with skin. Do not take internally. If swallowed, do not induce vomiting. Call a physician immediately. KEEP OUT OF REACH OF CHILDREN. Keep container covered when not in use. Do not thin. Dispose of in an environmentally safe manner. Cover air intakes during application and while drying.

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 THE DECK 48 HOURS AFTER IT STOPS RAINING.”

• VOC Content: <490 g/L
• Tested in compliance with FBC (HVHZ) TAS139
• Weight per Gallon: 9.7 lbs
• Maximum Shrinkage: 25%
• Colors: White, Black and Gray
• Tensile Strength: 40 psi
• Elongation: 500%
• Low Temp Flex: -40°F
• ASTM-C-734: No cracking/pass
• Recovery: 75% min.

SURFACE PREPARATION:
‍All surfaces to be sealed must be clean, dry and free from oil, grease and other foreign matter.

APPLICATION:

General Repairs:
Apply 502MS Karna-Flex by brush or caulking gun. For sealing flashings and lap seams use fabric reinforcement between layers of 502MS Karna-Flex. Apply sealer in a 1/16” to 1/8” width then immediately embed 5540 Resat-Mat Fabric into the wet coating. Smooth out fabric then apply another layer of sealer.

‍Metal Roofing Repairs:
For horizontal seams and cracks 1/16” wide or larger, apply 502MS Karna-Flex at an average thickness of 1/16” to completely cover the crack. Immediately embed one layer of Resat-Mat and cover with another application of 502MS Karna-Flex. Make sure to smooth the fabric out completely and cover. Product will cure within approximately 24 hours. If continuing with 502 Elasto-Kote System is desired, allow all repairs to cure before proceeding. Apply caulking directly in and over cracks using appropriate caulking gun.

COVERAGE RATE:
502MS Karna-Flex is typically applied in a 1/16” to 1/8” thickness depending upon the substrate which equates to a coverage rate of 4 to 8 gallons per 100 sq. ft. When sealing cracks and joints apply in two applications with fabric reinforcement.

Coverage Rates with Fabric Reinforcement:
Approximate Fabric Width 4", 6"
If Mastic Applied at 1/16" thick, two applications expect 25 lineal feet per gallon with 4" fabric and 18 lineal feet per gallon with 6" fabric.
If Mastic Applied at 1/8" thick, two applications expect 12 lineal feet per gallon with 4" fabric and 9 lineal feet per gallon with 6" fabric.

Fastener Coverage:
Place a dollop (swirl coat) over exposed fasteners. Approximate coverage rate is 250 fasteners per gallon.

Caulking Cartridge:
A 1/4" x 1/4" bead will yield approximately 75 lineal feet per 30 oz. cartridge.

NOTE:
502MS Karna-Flex White is not recommended for use over asphaltic substrates due to the likelihood of asphalt bleed through. For this reason, 502MS Karna-Flex Black is recommended over these types of substrates. PVC and TPO roofs should at least be 4 years old before using this product on.