WEBERPRIM BT-MAX
Weberprim BT-MAX is a polymer emulsion-based primer specially developed for fair-faced concrete surfaces. It is used before plaster or gypsum applications, particularly on highly absorbent wall and ceiling surfaces, to:
- Balance surface absorbency
- Improve adhesion
- Extend the working time of plaster and gypsum
- Enhance the performance and durability of finishing layers
It minimizes application issues on challenging substrates such as fair-faced concrete and ensures a stronger bond between the substrate and subsequent coatings.
Areas of Use
According to Weber technical documentation, Weberprim BT-MAX is suitable for:
- Fair-faced concrete surfaces
- Highly absorbent walls and ceilings
- Before cement-based plaster applications
- Before gypsum-based plaster applications
- Improving surface adhesion in both interior and exterior environments
The product is specifically designed to ensure strong adhesion of plaster and gypsum coatings to the substrate.
Advantages
High Adhesion
Strengthens the bond of plaster and gypsum on difficult surfaces such as fair-faced concrete.
Controls Water Absorption
Regulates the high absorbency of concrete surfaces, allowing proper hydration and curing of plaster applications.
Easy and Fast Application
Provides a uniform primer layer with a single coat using a textured roller.
Improves Plaster Performance
Allows plaster and gypsum coatings to cure more effectively and achieve greater durability.
Compatible with Cement and Gypsum
Offers excellent compatibility with all cement-based and gypsum-based plasters.
Technical Specifications
| Property | Value |
|---|
| Packaging | 12 kg – 25 kg |
| Application Area | Walls and Ceilings |
| Color | Turquoise |
| Density | 1.54 kg/L |
| Application Tool | Textured roller |
| Application Temperature | +5°C to +35°C |
| Drying Time | 60–120 minutes |
| Subsequent Application | Plaster/gypsum application after a minimum of 24 hours |
Application Steps
Surface Preparation
- The substrate must be clean, dry, and sound.
- Remove dust, dirt, oil, and any materials that may prevent adhesion.
Application
- Apply evenly to the surface using a textured roller.
- The product is ready to use and should be applied directly from the container without dilution.
Drying
- Drying time is approximately 60–120 minutes.
- Plaster or gypsum applications should begin no earlier than 24 hours after primer application.
Finishing Applications
- Cement-based and gypsum-based plasters should only be applied after the primer has completely dried.
Important Considerations
- Do not apply to wet or damp surfaces.
- Use only within the temperature range of +5°C to +35°C.
- Do not apply where there is a risk of frost.
- Avoid drying under direct sunlight and store the product in shaded conditions.
Recommended Substrates
- Fair-faced concrete ceilings
- Reinforced concrete columns and beams
- Highly absorbent walls
- Structural concrete surfaces
- Uneven surfaces before gypsum plaster applications
Weberprim BT-MAX is considered one of the most effective polymer emulsion-based primers for preparing fair-faced concrete surfaces before plastering.
Frequently Asked Questions (FAQ)
Why is it necessary for fair-faced concrete?
Fair-faced concrete is highly absorbent. Weberprim BT-MAX regulates water absorption and helps plaster cure properly.
Can it be applied on painted surfaces?
No. The surface must be thoroughly cleaned and free of paint before application.
When can plaster be applied after priming?
A minimum waiting time of 24 hours is required.
Which tools should be used for application?
The product should be applied using a textured roller.
Can it be used outdoors?
Yes. It can be used in exterior applications when suitable surface conditions are provided.
Is the product water-based?
Yes. It is based on a polymer emulsion formulation.
Is it compatible with different types of plaster?
Yes. It is compatible with all cement-based and gypsum-based plaster systems.