WetSuit® UNDERCOVER is a concealed, fluid-applied waterproofing membrane designed to provide reliable, long-term protection beneath surface finishes. It is used in areas where waterproofing must remain hidden, such as under tiles, screeds, pavers, insulation systems, or other overburden layers.
Key Benefits
Concealed waterproofing solution for under-finish applications
Seamless, fully bonded membrane with no joints or laps
Excellent crack-bridging capability and long-term flexibility
High resistance to water ingress and hydrostatic pressure
Compatible with a wide range of finishes and construction systems
Key Features
Seamless concealed membrane Forms a fully bonded, joint-free waterproof layer beneath finishes, eliminating weak points commonly associated with sheet membranes.
Exceptional flexibility & crack bridging Maintains performance across structural movement, thermal expansion, and minor substrate cracking.
High durability & long service life Engineered for long-term protection in demanding environments, ensuring reliable waterproofing performance over time.
Excellent adhesion to substrates Bonds effectively to concrete, screed, masonry, cementitious boards, and other approved substrates.
Low VOC & environmentally responsible Low VOC formulation supports sustainable construction practices and safer on-site application.
Typical Applications
- Bathrooms and wet areas
- Balconies and terraces (under tiles or pavers)
- Podiums and decks
- Planter boxes and landscaped areas
- Kitchens and utility rooms
Compatible Substrates
- Concrete and reinforced concrete
- Cement screeds
- Masonry and blockwork
- Cementitious boards
- Primed metal and other approved substrates
System Compatibility
- WetSuit® primers
- WetSuit® detailing and reinforcement fabrics
- REFLEX™ and HarcoSil topcoat systems (where applicable)
- Fully integrated WetSuit® waterproofing system from substrate to finish
Application Methods
- Roller application
- Brush application for detailing and penetrations
- Airless spray (project dependent)
- Easy-to-apply formulation for efficient installation across complex details and junctions
Performance Characteristics
- Fully waterproof and watertight membrane
- Flexible and elastomeric performance
- Resistant to moisture, alkalinity, and common construction chemicals
- Designed to perform beneath overburden and surface finishes
Why Choose WetSuit® UNDERCOVER?
WetSuit® UNDERCOVER is the ideal choice when waterproofing must be effective yet invisible. By combining advanced elastomeric technology with seamless application, it delivers dependable protection without affecting design intent or surface aesthetics.
