Modified Silicone Roof Sealant for Fluorine-Coated Steel & Roof Applications

Superior Adhesion. High Flexibility. Built for Roofs.

The SHARPIE RoofCaulk NB-Q (MSC1-20) is a high-performance, one-component modified silicone sealant designed specifically for roofing and metal joint applications. With its exceptional adhesion to fluorine-coated color steel sheets and wide range of roofing materials, this sealant delivers unmatched weatherability, UV resistance, thermal stability, and a quick curing profile for efficient installation.

Engineered for modern roof construction, this low modulus, high elongation sealant is ideal for external environments requiring a clean finish and long-term sealing performance. It provides reliable bonding without the need for a primer on non-porous surfaces, and excellent paintability for finishing aesthetics.

Key Features

• Excellent Adhesion – Bonds strongly to fluorine-color steel and most roof materials without primer.
• High Flexibility – Elongation at break up to 375% with stress-absorbing low modulus profile.
• Fast Skin-Over Time – Quick curing for efficient construction even in varying temperatures.
• Durable Weatherproofing – Withstands UV, temperature extremes (-50°C to 150°C), and outdoor conditions.
• Non-Staining & Paintable – Maintains clean appearance on visible joints and compatible with most paints.
• JSIA F☆☆☆☆ Certified – Low VOC emission rating for green building compliance.

Recommended Applications

• Fluorine-coated color steel roofs
• Metal panel joints and flashing
• Roof membrane sealing
• Duct perimeter sealing
• General outdoor and indoor construction joints

Technical Specifications

• • Base: MS Polymer (Modified Silicone)
  • Consistency: Paste

• Density: 1.27 g/mL
• Hardness (Shore A): 22
• Elongation at Break: 375%
• Maximum Tensile Strength: 1.25 N/mm²
• Service Temperature: -50°C to 150°C
• Tack-Free Time: 35 minutes (23°C, 50% RH)
• Non-Volatile Content: 93%

Available Colors

White, Ivory, Silver, Grey, Black, Dark Red, Dark Blue, Dark Green, Dark Brown, Bluish Green

Packaging

• 320ml cartridges (10 per box, 2 boxes per bale)
• Recommended primer for porous substrates: SHARPIE Primer P-50 (500g/can)

Limitations & Usage Notes

• Do not use on glass, marble, asphalt, or volatile-rich surfaces
• Not suitable for oil-based or oxidatively polymerized paints
• Do not apply during rain or snow
• Ensure all bonding surfaces are clean, dry, and dust-free Certifications
• JSIA F☆☆☆☆ – Highest VOC safety rating
• Meets internal durability and performance tests for building sealants