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Flash Harry Grey Liquid Plastic Waterproofing Sealer 20L | Build It DTM

Protect your property against water penetration with Flash Harry Grey Liquid Plastic Waterproofing Sealer 20L, a flexible acrylic waterproofing solution designed for suitable roofing and exterior building maintenance applications. Supplied in a generous 20-litre container, this waterproofing product is ideal for homeowners, roofing contractors and maintenance professionals working on larger waterproofing projects.

The Flash Harry Grey Liquid Plastic WP/Sealer 20L is designed to create a protective waterproofing coating on properly prepared and compatible surfaces. Its flexible formulation helps accommodate limited surface movement while providing protection against moisture and changing weather conditions.

Featuring a practical grey finish, this liquid waterproofing sealer is suitable for roof maintenance, parapet walls, flashings and other approved waterproofing applications.

Key Features and Benefits

• 20-Litre Container: Convenient for larger waterproofing and roof maintenance projects.

• Grey Finish: Provides a neutral protective coating appearance.

• Flexible Acrylic Formulation: Designed to accommodate limited movement in compatible building surfaces.

• Waterproofing Protection: Helps reduce water penetration when correctly applied.

• UV-Resistant Properties: Suitable for approved exterior applications exposed to sunlight.

• Protective Coating: Forms a waterproofing layer over properly prepared surfaces.

• Brush or Roller Application: Practical for professional and DIY waterproofing projects.

• Membrane Compatibility: Can be used with a compatible waterproofing membrane for reinforced applications.

• Versatile Use: Suitable for approved roofing surfaces, parapet walls and flashings.

Flexible Acrylic Waterproofing Technology

The Flash Harry Grey Liquid Plastic Waterproofing Sealer features a latex-modified acrylic formulation designed to provide flexibility and waterproofing performance.

Roofing surfaces experience expansion and contraction due to changing temperatures. A flexible waterproofing coating helps accommodate limited movement while maintaining a protective barrier.

When applied according to the manufacturer’s recommendations, Flash Harry Liquid Plastic can help protect suitable roofing and building surfaces against moisture penetration.

Its grey finish provides a practical appearance for exterior maintenance applications.

Ideal Waterproofing Applications

The Flash Harry Grey Liquid Plastic 20L is suitable for consideration in various waterproofing projects, including:

• Roof waterproofing

• Parapet walls

• Roof flashings

• Corrugated metal roofing

• IBR roofing

• Roofing lap joints

• Roofing screw areas

• Suitable exterior wall surfaces

• General roof repairs

• Preventative building maintenance

Always confirm surface compatibility and application requirements before use.

Roof Waterproofing and Protection

Roofs are continuously exposed to sunlight, rain, wind and temperature changes, which can contribute to coating deterioration and water penetration.

The Flash Harry Grey Waterproofing Sealer 20L is designed to help protect compatible roofing surfaces by forming a flexible waterproofing layer.

It is particularly useful for maintenance projects involving vulnerable roofing details such as joints, flashings and parapet walls.

For areas requiring additional reinforcement, the product can be used with a compatible waterproofing membrane as part of a suitable waterproofing system.

Waterproofing Membrane Reinforcement

For reinforced waterproofing applications, Flash Harry Liquid Plastic Grey can be applied together with a compatible waterproofing membrane.

The membrane provides additional reinforcement around vulnerable areas such as roofing joints, flashing details and other suitable surfaces.

Correct membrane installation and coating application are essential for effective waterproofing performance.

Always follow the manufacturer’s recommended waterproofing system, including the required number of coats and drying intervals.

Suitable for Larger Waterproofing Projects

The 20-litre container makes Flash Harry Grey Liquid Plastic a practical choice for larger roofing and maintenance applications.

It is suitable for contractors and property maintenance teams working on projects where multiple smaller containers may be less convenient.

Its flexible formulation and compatibility with suitable waterproofing systems make it useful for residential, commercial and industrial maintenance projects.

For larger areas, calculate the total surface size and allow sufficient material for the recommended coating system.

Surface Preparation and Application

Proper surface preparation is essential when applying Flash Harry Grey Liquid Plastic Waterproofing Sealer 20L.

Before application, ensure the surface is clean, dry and free from loose paint, dirt, dust, grease and other contaminants.

For effective application:

• Remove loose or damaged surface material.

• Clean the area thoroughly.

• Repair significant cracks or defects using suitable materials.

• Apply an appropriate primer where required.

• Use a compatible waterproofing membrane for reinforced applications.

• Apply the product using a suitable brush or roller.

• Follow the manufacturer’s recommended drying times.

• Avoid application during unsuitable weather conditions.

The product should not be used on incompatible surfaces or in applications involving permanent water immersion unless specifically approved by the manufacturer.

Waterproofing Coverage

The coverage of Flash Harry Grey Liquid Plastic 20L depends on the surface condition, porosity and application method.

For reinforced waterproofing systems, an approximate consumption rate of 2–2.5 litres per square metre may apply.

Based on this rate, a 20-litre container may cover approximately 8–10m² for a reinforced waterproofing system.

Actual coverage can vary depending on the surface condition, membrane requirements and coating thickness.

Always confirm the manufacturer’s current technical recommendations before calculating the quantity required.

Ideal for Contractors and Homeowners

The Flash Harry Grey Liquid Plastic Waterproofing Sealer 20L is a practical choice for:

• Roofing contractors

• Building contractors

• Property maintenance teams

• Renovation professionals

• Homeowners

• Handymen

• Property developers

• Experienced DIY enthusiasts

Its larger container size makes it particularly useful for ongoing maintenance and more extensive waterproofing projects.

Cleaning and Maintenance

Regular inspection and maintenance can help preserve the performance of a waterproofing system.

For ongoing care:

• Inspect waterproofed surfaces periodically.

• Keep roof drainage outlets clear.

• Remove accumulated dirt and debris.

• Check for visible coating damage.

• Repair damaged sections using compatible waterproofing materials.

• Avoid unnecessary foot traffic over treated surfaces.

• Follow the manufacturer’s maintenance recommendations.

Clean application equipment according to the manufacturer’s instructions, preferably before the coating has fully dried.

Why Choose Flash Harry Grey Liquid Plastic 20L?

The Flash Harry Grey Liquid Plastic Waterproofing Sealer 20L combines a flexible acrylic formulation with practical waterproofing functionality.

Its neutral grey finish, larger 20-litre container and suitability for compatible roofing applications make it an excellent option for residential, commercial and industrial waterproofing maintenance.

Whether you’re carrying out preventative roof maintenance or addressing vulnerable waterproofing areas, this product can form part of a suitable protective waterproofing system when correctly applied.

Availability

Get Flash Harry Grey Liquid Plastic Waterproofing Sealer 20L at Build It DTM, your destination for waterproofing products, roofing materials, paints and hardware in Benoni, Gauteng.