Step 2 · Metal roof primer
Shieldseal W Plus
A primer engineered for chalky metal and previously unpainted metal roofing. Its adhesion comes from a thin tack coat, so prep goes fast and crews move on to the finish coats sooner.
4 gal pails
Up to 1,937 ft² per pail
Recoat in 2 hr
Water clean-up
Features
- Advanced adhesion on chalky metal and previously unpainted metal, from a thin tack coat
- High coverage: up to 1,937 ft² per pail
- Quick dry: touch dry in 20 minutes, recoat in 2 hours
- Ready to use, no thinning; airless spray with a 517 tip
- Applies milky, dries clear; mold resistant
Specifications
| Pack size | 4 US gal pail |
|---|---|
| Coverage | Up to 1,937 ft² per pail |
| Solids | 20% average |
| Wet film thickness | 90 µm (≈3.5 mils) |
| Dry film thickness | 20 µm (≈0.8 mil) |
| Touch dry | 20 min |
| Recoat | 2 hr |
| Application temperature | 44.6–95 °F |
| Application | Airless spray, 517 or similar tip. No thinning. |
| Substrates | Chalky metal, previously unpainted metal roofing |
| Shelf life | 24 months |
| Clean-up | Water |
Source: Shieldcoat US Technical Data Sheet, September 2026. Actual coverage depends on substrate condition and application method.
Where it fits
Shieldseal W Plus is step 2 of a metal roof system: pressure clean at 3,000+ psi and rinse thoroughly, prime with Shieldseal W Plus, then topcoat with Roofbond, Nanobond or Thermobond HRC. Allow extra curing time in winter, and avoid spraying after 2 pm where possible.
For metal with active rust, contact us before specifying. See the primer selection guide.
Questions about Shieldcoat systems?
Talk to us about products, specs, or choosing the right system for a job.