Sealtek
HydroBlock – Seamless Acrylic Waterproofing Coating
HydroBlock – Seamless Acrylic Waterproofing Coating
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HydroBlock is a flexible, UV-stable waterproofing coating for roofs, slabs and foundations.
It forms a seamless, eco-friendly membrane ideal for new applications or refurbishment work — no flame or joint sealing required.
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Looking to Buy in Bulk or Request a Custom Quote?
We work closely with contractors, applicators, and businesses who need more than just a few litres.
Whether you're:
- Ordering in bulk
- Looking for custom colours
- Interested in becoming an approved applicator
- Or sourcing product for a large-scale project
We’re here to help.
All You Need To Know
What's included
- 5L or 20L HydroBlock Coating (Pure Acrylic)
- Primer sold separately: Repellam or AquaTint for cementitious surfaces
Key Features
- Seamless waterproofing
- UV-stable and weather-resistant
- Eco-friendly and water-based
- Flexible and durable membrane
- Brush, roller, or spray application
- No joints, no torch required
Application And Coverage
Waterproofing (4-Coat System):
- 10–25 m² per 20L depending on surface porosity
- Micron build: ±2000µ
- Touch dry in 1–2 hours
- Fully cured in 7 days
Paint Coating (2-Coat System):
- 40–60 m² per 20L
- Micron build: ±800–1000µ
- Water-resistant only (not waterproof)
Application Notes:
- Clean tools with water
- Surface temp: 5–35°C
- Apply with brush, roller or airless spray
Surface Preparation
- Remove all previous coatings and debris
- Eliminate salt, algae, fungi, and any contaminants
- Ensure moisture is <10%
- Prime cementitious surfaces with Repellam or AquaTint
- Metal surfaces do not require primer
- Allow primer to dry (±1 hour) before applying HydroBlock
Colour Options
Standard: Grey, White, Black, Terracotta, Green
Custom: 90+ colours available on request (MOQ applies)
Technical Data
- Form: Liquid
- Specific Gravity: 1.21
- pH: 8.92
- TSC: 49%
- Viscosity: 95–102 KU
- Abrasion Resistance: >10,000 cycles
- QUV (5000 hrs): Slight fading, no cracking, no delamination
- Waterproofing: Pass – no bubbling/lifting
- Boiling Point: >100°C