Board Seam Filler WB | Water-Based Seam Treatment
Board Seam Filler WB from PROSOCO is a gun-grade, water-based joint treatment designed to fill gaps and seams between gypsum boards, sheathing panels, or other porous building surfaces. This single-component acrylic paste is easy to gun, spread, and tool on site, making it ideal for pre-coating joints before applying FastFlash® or other R-Guard air barrier systems.
Product Description
Designed to simplify air barrier preparation, Board Seam Filler WB bonds without priming and offers fast, consistent application. Its breathable formulation allows surfaces to dry while maintaining a strong joint fill. With no solvents, phthalates, or isocyanates, it meets strict VOC compliance while offering jobsite safety and flexibility in all weather conditions.
Key Benefits of Board Seam Filler WB
- Fills seams in gypsum board and sheathing with a single-component, easy-to-use formula
- Bonds to most surfaces with no priming
- Water-based formulation allows simple cleanup and safe handling
- Flexible enough to remain intact when exposed to weather for up to 12 months
- Breathable to support substrate drying
Common Applications
- Field joint treatment for sheathing and gypsum board
- Part of R-Guard air and water barrier systems
- Transition filler before coating with FastFlash® or compatible PROSOCO coatings
Storage & Packaging
Available in 20-oz sausages and packaged in cases of 20. Store unopened in tightly sealed containers for up to 1 year.
Product Properties
| Property | Value |
|---|---|
| Form | Viscous paste, mild odor, orange color |
| Specific Gravity | 1.50 – 1.80 |
| pH | 8–10 |
| Total Solids | 87% |
| VOC Content | 25 g/L, maximum |
| Flash Point | No data |
| Freeze Point | 32°F (0°C) |
| WT/GAL | 12.5–15 lbs |
| Shelf Life | 1 year in tightly sealed, unopened container |
Also see AirDam for compatible sealant solutions. Visit PROSOCO for full building envelope products.
