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Exposed waterproofing membranes, particularly at vulnerable turn-ups and penetrations, face constant UV attack. Without protection, their performance degrades, leading to premature failure. SILCOR Top Coat 75 provides that essential UV shield and a durable, foot-trafficable finish, ensuring underlying SILCOR membrane systems remain intact and functional for the long term.
SILCOR Top Coat 75 was engineered to extend the service life of SILCOR liquid-applied waterproofing membranes in exposed conditions. It functions as a two-part, aliphatic polyurethane coating applied over the membrane, specifically formulated to resist UV degradation and provide a durable, non-slip surface. This allows SILCOR membranes to be used in areas traditionally problematic for exposed waterproofing, including plant room roofs, balconies, and critical flashing details.
Application begins with ensuring the SILCOR membrane surface is clean and dry. SILCOR Top Coat 75 is a two-part system, requiring thorough mixing of the Resin and Hardener components at a 5:1 ratio by weight. A high-speed dissolver for 5 minutes ensures a homogeneous blend. Application is typically in two coats using a brush or roller, with the second coat applied in a cross-direction to ensure uniform coverage and finish. For larger areas, it can also be sprayed in a single wet-on-wet application. Clean-up of tools and spills before curing is achieved with MULTITEK Xylene or methylated spirits.
SILCOR Top Coat 75 is the final, protective layer in an exposed SILCOR waterproofing system. It is specifically designed for application over all grades of SILCOR waterproof membranes, including SILCOR 575 LB, enabling these membranes to perform reliably in direct sunlight. This top coat shields the membrane from UV radiation and provides a durable, foot-trafficable surface. If future finishes like tiles or paint are required over the top coat, the surface first needs sealing with a compatible primer like SILCOR Primer BW Grey or EPOCOTE F100W Grey.
The UL Class A fire resistance rating provides critical assurance for safety in exposed building areas, particularly on roofs, meeting stringent fire performance standards. This contributes to the overall compliance and safety of the complete waterproofing system.
No, SILCOR Top Coat 75 is specifically designed for use as a protective coating over SILCOR membrane systems only. It provides protection to all grades of SILCOR waterproof membranes in exposed external situations.
Trades can access the area quickly due to its fast cure properties. The coating has a dry time of 2 hours at 25ºC, allowing for efficient project sequencing.
Yes, SILCOR Top Coat 75 can be painted or tiled. This requires pre-sealing the surface with SILCOR Primer BW Grey or EPOCOTE F100W Grey before proceeding.
No, you must not add solvent to SILCOR Top Coat 75. The product is formulated for direct use, and adding solvent can compromise its performance and cure.
| Application | Key benefit | Primary trades |
|---|---|---|
| Exposed plant room and lift motor room roofs | Provides a durable, UV-resistant, and foot-trafficable finish that protects the underlying SILCOR membrane from degradation. | Waterproofers, commercial builders |
| Balconies and decks over SILCOR membranes | Creates a non-slip, colour-fast surface resistant to UV and general foot traffic, extending the life of the waterproofing system. | Waterproofers, flooring contractors |
| Perimeter turn-ups, penetrations, sill and window flashings | Ensures localised protection for critical details, maintaining system integrity against UV exposure and weathering. | Waterproofers |
| Protection of SILCOR waterproof membranes in external situations | Offers fire resistance (UL Class A) and immediate resistance to rain damage, providing robust long-term performance. | Commercial builders, roofers |
Consult the product's Material Safety Data Sheet (MSDS) for comprehensive health and safety information before use.
Always wear appropriate protective clothing, chemical-resistant gloves, and protective goggles when handling and applying SILCOR Top Coat 75.
Store sealed pails in a cool, dry, protected area away from direct sunlight and weather exposure. The product has a 12-month shelf life under these conditions. Once opened, the product may solidify rapidly within a few days. Dispose of contents and container according to local regulations.
Proper substrate preparation is critical for the long-term performance and adhesion of the topcoat. Ensure surfaces meet the specified conditions before application.
Surface prep: The surface of the cured SILCOR membrane must be clean and completely dry. Remove any dust, debris, or contaminants that could inhibit adhesion.
Primer: Not required for this topcoat application over a clean, dry SILCOR membrane. The topcoat is designed to bond directly to the SILCOR membrane.
| Property | Value |
|---|---|
| Drying Time @ 25ºC | 2 hours |
| Shore Hardness | 75-80°A |
| Tensile Strength (AS1145) | 2 MPa |
| UV Resistance (System) | Excellent |
| Fire Resistance | UL Class A |
| Mix Ratio (Resin : Hardener) | 5:1 by weight |
| Minimum Coverage | 0.3 kg/m² |
| Minimum Dry Film Thickness (DFT) | 0.15 mm |
| Shelf Life | 12 months |
Here are some common examples on where Silcor Top Coat 75 used by our customers.
Waterproofing
When SILCOR membrane systems on balconies, roofs, or perimeter turn-ups are exposed to Australian UV and foot traffic.
This two-part aliphatic coating protects SILCOR membranes from UV degradation, delivering a durable, colour-fast, and foot-trafficable finish.
Civil Construction
Specifying a protective coating for exposed SILCOR membranes in areas requiring a certified fire-resistant finish.
The coating provides UL Class A fire resistance, essential UV protection, and a durable, trafficable finish for critical exposed SILCOR membrane systems.
Waterproofing
When Silcor liquid membranes are left exposed to direct sunlight on plant room roofs, requiring long-term UV protection.
This 2-part aliphatic polyurethane coating shields Silcor membranes from UV degradation, extending their service life and preventing premature failure.
Waterproofing
Specifying a durable, non-slip finish over Silcor membranes on balconies, decks, or roof access areas.
Provides a tough, service-foot-trafficable and colour-fast layer over Silcor membranes, offering built-in slip resistance and fast curing.
Waterproofing
Minimising project downtime and enabling quick access for follow-on trades on recently waterproofed SILCOR decks or roofs.
Its fast-curing aliphatic polyurethane formulation allows quick access, accelerating project timelines while providing essential UV and foot traffic protection.
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