Sand Fixing Agent / Interface Agent

Concrete surface hardener — essential preparation before waterproof coating

Sand fixing agent interface agent
Surface Preparation Essential

Fix Weak Surfaces Before Coating

Poor-quality concrete that crumbles or sands when you rub it will cause any waterproof coating to peel off within months. This high-penetration polymer agent soaks into the weak surface layer, hardens it, and creates a solid bonding base. Use this before applying PU coating, JS coating, or liquid membrane to guarantee adhesion and long-term performance.

  • Increases concrete surface hardness by 5-8 points
  • Deep penetration — consolidates loose, sandy substrates
  • Creates strong bonding surface for subsequent coatings
  • Prevents coating peeling, blistering, and delamination
  • Water-based, low odor, easy application
  • Essential companion product — sell alongside waterproof coatings
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Specifications

Technical Data

Product TypeWater-based polymer penetrant / interface agent
AppearanceMilky white liquid
Solid Content≥ 18%
Penetration Depth2-5mm
Hardness Increase5-8 points (pencil hardness)
Drying TimeSurface dry 30-60 min, apply coating after 4 hours
Coverage0.15-0.25 kg/m²
ApplicationBrush, roller, or spray
Shelf Life18 months (sealed)
Packaging5kg / 10kg / 20kg
MOQ50 buckets

Frequently Asked Questions

When should I use sand fixing agent before waterproof coating?

Use sand fixing agent when the concrete surface feels powdery, sandy, or chalky when you rub it. If loose particles come off easily, the surface is too weak for direct coating application. Sand fixing agent penetrates and hardens the surface, ensuring your waterproof coating bonds properly and does not delaminate.

How much does sand fixing agent cost per square meter?

Coverage is 0.15-0.30 L/m², making it very economical — approximately $0.30-0.50/m². This small investment prevents waterproof coating failure that would cost $30-50/m² to rework. Always cheaper to prepare properly than to repair later.

Can sand fixing agent be used on old concrete floors?

Yes. Sand fixing agent is especially effective on aged, weathered concrete surfaces. It consolidates loose particles, hardens the surface layer, and creates an ideal bonding substrate for subsequent coatings, paints, or tile adhesive applications.

Bundle with Waterproof Coatings for Complete Solutions

Sell sand fixing agent as a companion product with PU coating or JS coating. Higher order value, better results for your customers.

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