Karnak 671 Karna-Seal Roof Sealant 2.5 gal

The Karnak 671 Karna-Seal Roof Sealant 2.5 gal is a caulk & sealant for jobs that require Karnak model/MPN 671 in the 2.5G sell unit. 671 Karna-Seal is a single-component, moisture curing, 100% silicone roof sealant that offers excellent UV resistance, flexibility, and tensile strength.

Key Specs

• Brand: Karnak
• Model / MPN: 671
• SKU: KAR671
• Sell unit: 2.5G
• Product type: Caulk & Sealant
• Size / color: 2.5 gal
• Category: Building Materials | Building Materials/Caulk & Sealant
• Coverage / unit: 2.5 gal per listed unit

Key Features

• Resists permanent ponding water
• Application by brush
• Bonds to several different roof substrates
• Low VOC, low odor
• For horizontal and vertical use, will not sag
• Rain safe in one (1) hour

Coverage & How Much You Need

This item is listed as 2.5 gal per listed unit. Use the project takeoff, manufacturer installation instructions, and expected waste/overlap to confirm the order quantity.

Compatibility / Fitment

Use this item only when the brand, model/MPN, size/color, sell unit, and system type match the project specification. Do not substitute it for a different caulk & sealant, pack size, color, membrane/system family, or installation condition without checking the manufacturer instructions.

FAQs

What exactly am I ordering?

Karnak 671 Karna-Seal Roof Sealant 2.5 gal, sold as 2.5G, with SKU KAR671 and manufacturer model/MPN 671.

What model or part number should I match?

Match model/MPN 671 and confirm the brand is Karnak. If the job spec lists a different model, size, color, or system family, hold for review.

What unit is the price based on?

This listing is built around the 2.5G sell unit. Confirm the unit before comparing price, quantity, or coverage.

How do I estimate quantity?

Use 2.5 gal per listed unit, then add waste or overlap per the manufacturer instructions and the project design.

What should be checked before purchase?

Confirm the model/MPN, sell unit, size/color, jobsite condition, compatible system components, and any manufacturer installation limits before approving the order.

Roofing and exterior-envelope work can involve fall hazards, weather exposure, fumes, adhesives, and system-specific installation requirements; follow the manufacturer instructions, OSHA-safe work practices, and local code or use a qualified contractor.

Product Expert Notes

Choose this item when Karnak model/MPN 671, SKU KAR671, and the 2.5G sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.