The CertainTeed SMARTCOAT 350 Silicone Mastic is a specialty membrane accessories for jobs that require CertainTeed model/MPN 412090 in the 2G sell unit. SMARTCOAT 350 Silicone Mastic is a professional grade high performing silicone mastic intended to seal leaking seams, fasteners, penetrations and/or any splits, tears or deficiencies in the roofs surface prior to coating with SMARTCOAT 450 High Solids Silicone Coating

Key Specs

• Brand: CertainTeed
• Model / MPN: 412090
• SKU: CER412090
• Sell unit: 2G
• Product type: Specialty Membrane Accessories
• Size / color: 2 gal
• Category: Commercial Roofing | Commercial Roofing/Membrane Accessories | Commercial Roofing/Membrane Accessories/Specialty Membrane Accessories
• Coverage / unit: 2 gal per listed unit

Key Features

• Seals deficiencies in roof surface
• High elasticity – accommodates wide swings in temperature and significant building movement
• UV-stable, coating not required

Coverage & How Much You Need

This item is listed as 2 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 specialty membrane accessories, pack size, color, membrane/system family, or installation condition without checking the manufacturer instructions.

FAQs

What exactly am I ordering?

CertainTeed SMARTCOAT 350 Silicone Mastic, sold as 2G, with SKU CER412090 and manufacturer model/MPN 412090.

What model or part number should I match?

Match model/MPN 412090 and confirm the brand is CertainTeed. 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 2G sell unit. Confirm the unit before comparing price, quantity, or coverage.

How do I estimate quantity?

Use 2 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 CertainTeed model/MPN 412090, SKU CER412090, and the 2G sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.