FastFlash | High-Performance Liquid Flashing Membrane
FastFlash is a versatile liquid flashing membrane designed for use on rough openings, transitions, and seams in new or existing wall assemblies. This gun- or roller-grade solution creates a seamless, durable barrier against water and air intrusion, effectively protecting building envelopes. Engineered by PROSOCO, FastFlash is ideal for waterproofing projects in commercial and residential construction and is a key component in the R-Guard air and water barrier system.
Product Description
Formulated as a red, viscous paste, FastFlash cures to a durable elastomeric seal that is compatible with most building materials. It fills small cracks, counter-flashes joints, and can be used around penetrations to eliminate water entry points. With a VOC content of only 30 g/L, it meets sustainability benchmarks while delivering performance that exceeds industry standards. Its high solids content and wide temperature tolerance ensure it remains reliable in varied environmental conditions.
Key Benefits of FastFlash
- Forms a seamless, fully adhered waterproofing layer
- Compatible with R-Guard air and water barrier systems
- Primerless adhesion to most common construction surfaces
- Quick and easy application with gun or roller
- Highly flexible and durable once cured
- Passes key sustainability standards, including Red List Free, Declare, and VOC Compliance
Common Applications
- Rough openings in windows, doors, and curtain walls
- Transitions between dissimilar materials
- Sealing cracks, seams, and penetrations
- New construction and retrofit waterproofing projects
Storage & Packaging
FastFlash is available in 29-oz tubes, 20-oz sausages, and 2-gallon roller-grade containers. Store unopened in a cool, dry place for up to one year. Protect from freezing temperatures.
Product Properties
| Property | Value |
|---|---|
| Shelf Life | 1 year in tightly sealed, unopened container |
| VOC Content | 30 g/L maximum |
| Form | Viscous paste, mild odor, red color |
| Flash Point | >200 °F (93 °C) |
| Total Solids | 99% |
| Coverage Rate | 22–28 sq ft per 29 oz tube, 15–17 sq ft per 20 oz sausage, 50–100 sq ft per gallon |
| WT/GAL | 11.75 – 12.5 lbs |
| Available Sizes | 29-oz tube, 20-oz sausage, 2-gal (roller-grade) |
Looking for a companion product for detailed joints and seams? Check out the Joint & Seam Filler Sealant. Learn more about FastFlash at PROSOCO.
