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ST400 Waterborne Primer for Cement Substrates

ST400 is a two-component waterborne epoxy primer specially developed for cement-based substrates. It features excellent penetration and sealing capability, significantly improving topcoat adhesion and extending the overall coating system’s durability.

It is ideal for use in sports courts, cement flooring, and underground spaces, and serves as an essential base treatment in waterborne coating systems.

Application Areas

  • Cement grandstands
  • Indoor and outdoor sports courts
  • Underground garages and parking structures
  • Industrial cement floors

Note: For any waterborne coating system applied to cement substrates, it is strongly recommended to use ST400 as the sealing primer. Failure to do so may result in peeling, delamination, or cracking.

Key Features

  • Waterborne and eco-friendly: Non-toxic and low odor; safe for transport and on-site use
  • Excellent sealing and penetration: Strengthens substrate bonding and system durability
  • Superior adhesion: Achieves adhesion test grade 0–1
  • Indoor-outdoor versatility: Compatible with a wide range of cement-based environments

Instructions for Use

  • Preparation and Mixing
  • Thoroughly mix Components A and B before use.
  • If needed, clean water may be added (no more than 10%) to adjust viscosity.

Substrate Requirements

  • The substrate must be sanded, dry, clean, and free of standing water.
  • Construction environment: temperature ≥5°C, relative humidity <80%.
  • Avoid application during rainy weather.

Prohibitions

  • Strictly avoid contact with gasoline, thinners, solvents, or oil-based substances during construction.

Recoating

  • Topcoat can be applied at least 4 hours after the primer is dry to the touch.
  • The primer may appear slightly colored during application but will dry to a transparent finish. Minor color variation is normal.

Storage and Transportation

Packaging Specification: 18 + 2 kg/set

Storage Conditions: 5–35°C, dry and ventilated, protected from light and moisture

Shelf Life: 12 months (under sealed storage conditions)

Transportation: Non-hazardous; avoid freezing, rain, and direct sunlight during transit

Product Model Key Features Specification Reference Consumption (kg/m²)
ST300 Specialized primer for ceramic tiles and marble substrates 18 + 2 kg/set 0.1
ST400 Specialized primer for sanded cement and concrete surfaces 18 + 2 kg/set 0.1
Parameter ST300 ST400
Component Type Two-component Two-component
Appearance Milky liquid Milky liquid
Surface Dry Time (25°C) Approx. 30 minutes Approx. 30 minutes
Hard Dry Time (25°C) 24 hours 24 hours
Full Cure 7 days 7 days
Gloss Level Transparent, matte Transparent, matte
Water Resistance 96h – no blistering or peeling 96h – no blistering or peeling
Alkali Resistance 48h – no blistering or peeling 48h – no blistering or peeling

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