Karnak - 108 Asphalt Primer

The Karnak 108 Asphalt Primer is a general-purpose, penetrating asphalt-based primer designed for effective surface preparation. The product comes in two formats: a 1-gallon can for larger applications and a 14-oz spray can available in a case of 12. It is formulated to seal and revitalize porous substrates, such as concrete, masonry, gypsum, brick, and metal, providing a uniform base for hot or cold asphalt coatings or built-up roofing systems.

Key Features

• Penetrates and seals porous substrates to enhance adhesion for coatings
• Available in two convenient formats—1-gallon can for broad coverage; 14-oz spray can for tight spots or touch-ups
• Compatible with surfaces including concrete, masonry, gypsum, brick, metal, and aged built-up roofing
• Meets major industry standards including ASTM D-41, Federal Specification SS-A-701, and AASHTO M-116

Available sizes:

• 1-gallon can; 6 Cans/Case; 30 Cans/Case
• 14-oz spray can (12-count case)

Weight per gallon: approximately 7.74 lb

Solids by weight: 68% (nominal)

Solids by volume: 62% (nominal)

Color of cured film: black

Application temperature: 40 °F to 120 °F

Recommended coverage: 0.5 to 1 gallon per 100 sq ft (8–16 wet mils) depending on substrate porosity

Dry time: approximately 8 to 24 hours

Service temperature (cured film): –40 °F to 180 °F

VOC content: up to 350 g/L maximum

Application methods: brush or spray; liberally coat porous or built-up surfaces for best penetration

* This item is hazmat *

• Make sure the surface is clean, dry, and free from grease, oil, dust, or loose material.
• For the 1-gallon can: stir thoroughly and apply using a brush or roller. For precise areas, use the 14-oz spray can.
• Apply at the rate of 0.5 to 1 gallon per 100 sq ft, adjusting based on surface porosity for optimal penetration.
• Allow the primer to dry for 8 to 24 hours before applying subsequent coatings or membranes.
• Do not thin the product. Use boa ventilation and keep away from flame during application and drying.
• Clean tools with mineral spirits or Karnak-approved cleaner like Karna-Klean. Handle solvents safely.

Q: Why are there two container options for this product?
A: The 1-gallon can is ideal for large-area applications, while the 14-oz spray can is great for minor repairs, tight areas, or quick touch-ups.

Q: What surfaces can this primer be used on?
A: It works on a variety of substrates including concrete, masonry, gypsum, brick, metal, and aged built-up roofing.

Q: What coverage and application conditions are recommended?
A: Apply between 0.5 to 1 gallon per 100 sq ft using brush or spray techniques. Optimal application temperature is 40 °F to 120 °F.

Q: Can I use petro-chemical sealants after priming?
A: For best long-term performance, avoid petro-chemical sealants. Urethane or silicone sealants are typically recommended.

Q: What temperature range does the cured primer withstand?
A: Once cured, the primer performs continuously from –40 °F to 180 °F.