R-Guard PorousPrep

PROSOCO R-Guard PorousPrep is a water-based sealer that pre-treats raw gypsum board edges exposed in window and door rough openings before FastFlash or Joint & Seam Filler is applied.

What it does

The light-blue viscous liquid brushes on smoothly without runs or spills, sealing the porous cut edges of gypsum so the next-step flashing or filler bonds correctly instead of being wicked into the board. Drying typically takes 30–60 minutes.

When and where to use it

• Sealing cut gypsum sheathing edges in rough openings
• Prep step within R-Guard continuous air barrier systems
• Quick-turnaround construction schedules
• Projects targeting green-building certifications

Key benefits

• Water cleanup — no solvent disposal
• Quick drying (30–60 minutes)
• LEED verified, SCS Indoor Advantage, LBC Red List Free
• VOC compliant nationally and regionally
• Coverage 200–400 sq ft per gallon
• 2-year shelf life sealed
• pH 9.0; flash point >212°F