When it comes to protecting concrete and masonry surfaces from water damage, Costar 2K stands out as a reliable, durable, and easy-to-apply waterproofing solution. Whether You are working on a basement, roof, water tank, or wet area, Costar 2K provides the barrier needed to prevent moisture infiltration and structural damage.
 What is Costar 2K?
Costar 2K is a two-component, flexible cementitious waterproofing coating. It consists of a powder part (cement-based) and a liquid part (polymer-based) that, when mixed together, form a brushable slurry with excellent adhesion, flexibility, and water resistance.
Key Uses of Costar 2K
Costar 2K is designed for a variety of waterproofing applications, including:
- Bathrooms, kitchens, and wet areas
- Basements
- Water tanks and reservoirs (portable and non-portable)
- Balconies and terraces
- Swimming pools and water features
- Roofs and slabs before tiling
- Its flexibility allows it to handle substrate movements, making it ideal for both interior and exterior waterproofing.
How to Apply Costar 2K
Proper application is crucial for maximum effectiveness. Here’s a step-by-step guide:
1. Surface Preparation
Clean the surface thoroughly: remove dust, oil, grease, loose particles, or any contaminants. Repair any cracks or surface defects with a suitable repair mortar.
The substrate should be damp (not wet) before application — no standing water.
2. Mixing
Mix Part A (liquid) with Part B (powder) in the specified ratio (usually 1:2 by weight). Stir using a slow-speed mechanical mixer for 3–5 minutes until a lump-free, creamy consistency is achieved.
3. Application
-Apply the first coat using a brush or roller in one direction.
-Allow it to dry for 4–6 hours (or as recommended).
-Apply the second coat perpendicularly to the first to ensure full coverage.
-For critical areas like corners or pipe penetrations, reinforce with mesh or tape between coats.
4. Curing
Protect the coating from direct sun or rain for at least 24 hours. Full curing is typically achieved within 3–7 days.
Why Choose Costar 2K?
✔ Excellent adhesion to concrete, masonry, and bricks
✔ Flexible, resistant to cracks and minor movements
✔ Non-toxic – safe for potable water tanks
✔ Easy to mix and apply
✔ Compatible with tile adhesives and screeds
IN CONCLUSION
Whether you’re a contractor, waterproofing specialist, or DIY enthusiast, Costar 2K offers a trusted and versatile solution to protect your structure from the damaging effects of water. Its reliability, flexibility, and ease of use make it a go-to product in the construction chemical industry.
