Prosoco R-Guard FastFlash Liquid Flashing Membrane 29 oz. Cartridge

Prosoco R-Guard FastFlash is a high-performance, fluid-applied flashing membrane designed to create a durable, waterproof and airtight seal around windows, doors and other critical openings. This one-component, solvent-free formula adheres tenaciously to concrete, wood, masonry, fiber cement and many other substrates, forming a seamless barrier that resists water intrusion and air leakage. FastFlash cures rapidly in moderate temperatures, allowing faster cladding and finish installation without compromising long-term flexibility.

Whether you’re flashing rough openings, transitions between dissimilar materials or detailing challenging corners, FastFlash delivers exceptional elongation and recovery to accommodate building movement. Its low-odour, low-VOC composition makes it jobsite-friendly, while the cartridge format ensures clean, controlled dispensing with a standard caulking gun.

Key Features

• Rapidly cures to a tack-free membrane in minutes, reducing project timelines
• Outstanding adhesion to a wide variety of construction materials
• Elastomeric flexibility accommodates expansion, contraction and substrate movement
• Solvent-free, low-VOC formulation for safer jobsite conditions
• Cartridge design fits industry-standard caulking guns for precise application
• Ready for cladding and finish installation immediately after cure