The Karnak 505MS Karna-Flex WB Sealant White 3.5 gal is a caulk & sealant from Karnak for exact-match material ordering. Match manufacturer model/MPN 505WB-3.5. This variant is sold as 3.5G with SKU KAR50535. 505MS Karna-Flex WB is an acrylic elastomeric, water-borne mastic formulated for use on built-up asphalt roofing, modified bitumen membranes and properly prepared, single-ply membranes (TPO, PVC, Hypalon, and EPDM) and plywood roof substrates.

Key Specs

• Brand: Karnak
• Model / MPN: 505WB-3.5
• SKU: KAR50535
• Sell unit: 3.5G
• Product type: Caulk & Sealant
• Size: 3.5 gal
• Color / finish: 3.5 gal
• Category: Building Materials | Building Materials/Caulk & Sealant

Key Features

• White elastomeric sealant.
• Easy application by brush or bulk loading caulking gun
• Excellent adhesion to many surfaces

Coverage & How Much You Need

Confirm coverage/yield from the manufacturer instructions and job takeoff before ordering.

Compatibility / Fitment

Use only with compatible systems and installation conditions specified by the manufacturer.

FAQs

What exactly am I ordering?

Karnak 505MS Karna-Flex WB Sealant White 3.5 gal, sold as 3.5G, SKU KAR50535, manufacturer model/MPN 505WB-3.5.

What unit is the price based on?

The price is for the 3.5G sell unit.

What should I match before ordering?

Match brand, model/MPN where available, size/color, sell unit, and the project specification.

Can this be substituted?

Treat this as an exact-match building material selection; hold for review before substituting a different model, color, size, or system family.

How do I estimate quantity?

Use the project takeoff plus manufacturer installation instructions, including waste, overlap, and accessory requirements.

Follow manufacturer instructions, OSHA-safe work practices, local code, and project specifications.

Product Expert Notes

Choose this variant when Karnak, SKU KAR50535, 3.5G sell unit, and MPN 505WB-3.5 match the job requirement.