Step 2 · Roof primer
Shieldseal W
A clear penetrating primer for a wide range of roofing substrates, including asphalt shingles, clay tiles, concrete roof tiles and other porous roof surfaces. It goes on milky and dries clear.
4 gal pails
Up to 1,130 ft² per pail
Touch dry 20 min
Water clean-up
Features
- Penetrates deep into the substrate for maximum adhesion and a sound base for the topcoat
- For asphalt shingles, clay tiles, concrete roof tiles and other porous roof surfaces
- Applies milky, dries clear for an easy visual check of coverage
- Fast-drying: touch dry in 20 minutes, recoat in 2 hours
- Ready to use, no thinning; airless spray with a 517 tip
- Mold resistant
Specifications
| Pack size | 4 US gal pail |
|---|---|
| Coverage | Up to 1,130 ft² per pail |
| Solids | 22% average |
| Wet film thickness | 140 µm (≈5.5 mils) |
| Dry film thickness | 30–35 µm (≈1.2–1.4 mils) |
| Touch dry | 20 min |
| Recoat | 2 hr |
| Application temperature | 44.6–95 °F |
| Application | Airless spray, 517 or similar tip. No thinning. |
| Appearance | Milky liquid, dries clear |
| Shelf life | 24 months |
| Clean-up | Water |
Source: Shieldcoat US Technical Data Sheet, September 2026. Actual coverage depends on substrate condition, porosity and application method.
Application notes
- Pressure clean the roof at 3,000+ psi and rinse thoroughly.
- Allow extra curing time in winter, and avoid spraying after 2 pm where possible.
- Topcoat with Roofbond, Nanobond or Thermobond HRC.
For metal roofs, use Shieldseal W Plus. See the primer selection guide.
Questions about Shieldcoat systems?
Talk to us about products, specs, or choosing the right system for a job.