Nitoproof Top Coat EW: Technical Details, Specifications, and Features

Product Overview

Nitoproof Top Coat EW is a solvent-free hybrid clear sealer designed as a protective overcoating product that replaces the earlier formulation Emer-Proof Top Coat Extended Wear. It functions as a specialized topcoat applied over cured Nitoproof Top Coat UV membranes to enhance their protective and performance characteristics.

Key Applications

Nitoproof Top Coat EW is primarily used for:

• Sealing over Nitoproof Top Coat UV membrane coating to improve stain resistance, durability, and weathering properties
• Enhancing foot-traffic durability by reducing scuff marks associated with pedestrian activity
• Improving slip resistance when applied as an alternative overcoat over various Nitoproof base coatings including Nitoproof 410 and Nitoproof 810

Formulation & Environmental Advantages

Solvent-Free Properties

Nitoproof Top Coat EW is formulated as a solvent-free hybrid clear sealer, offering multiple environmental and safety benefits:

• Non-flammable formulation
• Free of hazardous odours
• Low VOC (volatile organic compound) content
• Environmental safety benefits inherent to solvent-free technology

Chemical Composition

The product is supplied as a liquid-applied membrane coating in 15-litre containers, maintaining accessibility and ease of handling for application on site.

Physical Properties (Wet Form)

Property	Specification
Specific Gravity	1.02 kg/litre
Solids Content	28%
pH Level	7.5 – 8.5
Appearance	Milky white in wet state; dries clear
Water Solubility	100% soluble in wet state (uncured)
Flammability	Nil

Performance Specifications

Hardness & Durability

• Hardness (ASTM D3346): >H (after 7 days)
• Scrub Ability (ASTM D2486): >20,000 times

Adhesion Properties

• Adhesion (ASTM D3359): Grade 1, indicating excellent adhesion characteristics

Weather & Chemical Resistance

• Weather Resistance (ASTM G23): >800 hours, demonstrating superior UV protection and durability
• Excellent UV degradation resistance and carbonation resistance
• Excellent chemical and water resistance
• Clear non-yellowing finish that maintains appearance over extended periods

Slip Resistance Performance

Nitoproof Top Coat EW has been tested for slip resistance when applied over different Nitoproof base coatings:

System Configuration	Wet Pendulum Test (AS 4586:2013 Appendix A)	Dry Floor Friction Test (AS 4586:2013 Appendix B)
Nitoproof 810 with Top Coat UV + Top Coat EW	P4	D1

Testing indicates that Nitoproof Top Coat EW applied over Nitoproof Top Coat UV creates systems with enhanced slip resistance characteristics, though variations are expected on-site due to site-specific conditions.

Application Specifications

Surface Preparation Requirements

Surfaces must be meticulously prepared before application:

• Clean, sound, and stable condition required
• Free of loose foreign material and existing foreign coatings
• Free of laitance, release agents, and curing compounds
• Free of oil and grease residues

Mixing Instructions

• Lightly stir before use to ensure uniform consistency

Application Method

• Applied in thin coating applications (critical requirement)
• Coverage rate: 8 square meters per litre per coat
• Application equipment: 6mm mohair roller sleeve or brush
• Recommended application: 2 coats depending on likelihood and degree of potential stains and marks

Application Thickness

Nitoproof Top Coat EW must be applied in thin coats rather than thick applications to achieve optimal performance characteristics.

Drying & Curing Times

Drying Stage	Duration
Tack-Free/Recoat Time	2–4 hours (varies with surface porosity and temperature)
Dry Film	8–12 hours
Foot Traffic Permitted	24 hours (based on normal ambient conditions of 23°C)
Additional Drying at 10°C	Minimum 24 hours additional drying time required

These timeframes are based on normal ambient conditions; surface and ambient temperatures significantly influence actual drying performance.

Finish Characteristics

• Initial semi-gloss finish forms immediately after application
• Finish diminishes to matt appearance after 10–14 days
• Clear, non-yellowing appearance maintained throughout service life

Storage & Shelf Life

• Shelf life: 2 years under proper storage conditions
• Must be stored in cool, dry conditions
• Must be kept in original unopened packs to maintain shelf life

Compatibility & System Integration

Compatible Systems

Nitoproof Top Coat EW is designed specifically for:

• Application over fully cured Nitoproof Top Coat UV (minimum 48 hours drying at 23°C required before application)
• Integration with waterproofing systems using Nitoproof 410 and Nitoproof 810 base membranes
• Enhancement of existing membrane systems for improved protection

Incompatible Surfaces

Nitoproof Top Coat EW should not be used over:

• Wax residues on surfaces
• Sandstone, limestone, and similar porous stone surfaces
• Applications in immersed areas
• Glass, fibreglass, chlorinated surfaces

Application Limitations

• Must be applied in thin coats only (not thick applications)
• Do not apply when rain is forecast within the curing times
• Not recommended for applications in immersed areas
• Not suitable for applications on materials with incompatible surface properties

Cleaning & Maintenance

During Application (Wet State)

• Clean up with water while product remains uncured

After Curing (Dried State)

• Removal requires Fosroc Solvent 10 or mechanical means

Maintenance

No special maintenance requirements specified. Any damage identified during normal inspections should be repaired or replaced as appropriate.

Key Product Distinctions

Nitoproof Top Coat EW represents a technological advancement as a solvent-free hybrid clear sealer combining:

• Environmental advantages of solvent-free formulation
• Protective performance of a hybrid acrylic coating
• Versatility in application over multiple Nitoproof membrane systems
• Enhanced durability and weather resistance characteristics

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References

• [1] Fosroc_Nitoproof_Top_Coat_UV_TDS.pdf
• [2] Fosroc_Nitoproof_Top_Coat_EW_TDS.pdf
• [5] Fosroc_Nitoproof_810_NZ_TDS.pdf
• [7] Fosroc_Nitoproof_410_NZ_TDS.pdf