BK-637PU 1K PU Primer for Exterior Use
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Description
1K PU Primer is a very fast-curing, low-viscosity, solvent-based, 1-component primer for outdoor use. BK-637PU is a low-viscosity, fast-drying polyurethane-based primer suitable for many substrates. It is suitable for both non-porous and porous substrates.
If you plan to seal and waterproof untreated stone and concrete surfaces, we strongly recommend using BK-637PU as a primer. BK-637PU prevents rising moisture from pushing up and detaching the sealing and waterproofing over time.
The rapid drying of the primer allows for the sealing and waterproofing of balconies & terraces on the same day in the second working step with our BK-635PU 1K PU sealer in clear or tinted in various colors.
Your advantages
- 1-component - easy to apply
- Alkali- and moisture-resistant
- Vapor-permeable
- Very fast drying
- No hardener required
- Suitable for smooth as well as open-pored/absorbent substrates
Matching additional products
- BK-635PU 1K PU sealer
- BK-605PU stone carpet set for outdoors
- BE-79W short-pile paint roller
- LS-711 thinner
- LS-565 rust stain remover for stone
- BE-800 concrete cleaner
Product data
- Color: clear
- Coverage: min. 150g/sqm per coat, depending on the substrate
- Tack-free at 25°C: after 1-2 hrs.
- Recoatable at 25°C: after 1-2 hrs.
- Application temperature +5°C - +35°C
- Storage: 12 months at temperatures of +5 - +25°C
Substrate preparation:
Substrates must be structurally sound and free from separating layers, cracks, loose parts, pinholes and burrs. Remove grease, wax, cement slurry and all other adhesion-reducing substances. Sand the substrate. After that, the substrates are primed.
Application:
Wear appropriate protective clothing during application, such as: safety glasses, disposable gloves, and respiratory masks if necessary. Apply the primer using a squeegee, paint roller or airless sprayer. No further dilution is necessary when using an airless sprayer. Apply the material quickly and evenly without puddles on the substrate. Depending on the flatness and porosity of the substrate, 100-300g/sqm is required for priming. Very absorbent substrates must be primed again. We recommend sanding substrates that will not be further processed on the same day with BK-705 quartz sand.
Technical specifications
| Property | Value |
|---|---|
| Coverage | 100-300 g/m² |
| Recoatable after | approx. 1-2 h at 25°C |
| Application | Roller, brushing, spraying |
| Colour | Colourless |
| Application temperature | +5°C to +35°C |
| Properties | Easy to apply, alkali- and moisture-resistant, vapour-permeable, very fast drying, suitable for both non-porous and porous substrates |
| Substrate | Concrete, tiles, bitumen, screed, wood, GRP, stone |
| Area of use | Exterior |
| Thinning / tool cleaning | LS-711 PU thinner |
| Typical use | Balcony, terrace, roof, garage, workshop, cellar and more |
Recommended Layering
Areas of application
Frequently Asked Questions
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