PorousPrep | Sealer for Dry-Cut Gypsum Wallboard Edges
PorousPrep by PROSOCO is a water-based edge sealer formulated to condition the exposed ends of raw gypsum board before air and water barrier installation. This light blue, glue-like liquid preps surfaces for effective adhesion of Joint & Seam Filler or FastFlash®, improving the performance and durability of the entire building envelope system. With quick drying and easy cleanup, PorousPrep is a critical first step for professionals seeking long-lasting air barrier performance.
Product Description
Applied with a brush, PorousPrep penetrates and seals gypsum board edges to prevent moisture absorption and enhance bonding. Its smooth, viscous texture minimizes spills and run-off while ensuring consistent application. It dries in as little as 30–60 minutes and contains no solvent odor, making it ideal for interior or exterior prep work.
Key Benefits of PorousPrep
- Optimizes edge prep for use with Joint & Seam Filler and FastFlash
- Glue-like consistency reduces drips, spills, and waste
- Low-VOC (<100 g/L), with no solvent odor
- Water cleanup; easy to apply and fast drying
- Compatible with most air and water barrier assemblies
Common Applications
- Exposed cut gypsum board edges in rough openings
- Drywall prep for windows, doors, or facade transitions
- Commercial projects requiring edge-sealed gypsum substrates
Storage & Packaging
PorousPrep is supplied in 1-gallon containers (also available as a case of 4). It has a shelf life of 2 years when stored in a tightly sealed, unopened container. This product is light blue with a mild odor.
Product Properties
| Property | Value |
|---|---|
| Form | Light blue viscous liquid, mild odor |
| PH | 9.0 |
| VOC Content | <100 g/L |
| Flash Point | >212°F (100°C) ASTM D 3278 |
| Freeze Point | 32°F (0°C) |
| Total Solids | 16% ASTM D 2369 |
| WT/GAL | 8.49 lbs |
| Coverage Rate | 200–400 sq ft per gallon, 600 linear ft per gallon |
| Shelf Life | 2 years in tightly sealed, unopened container |
| Available Sizes | 1-gal |
Also see StuccoPrime for compatible primer systems. Visit PROSOCO to explore air and water barrier solutions.
