Roof Pro Roof Repair Bituminous Mastic - Black

The Roof Pro Black Roofing Waterproofer is a protective coating designed to enhance the water resi...

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B&QB&Q - Roof Repair Black Bituminous Mastic1L
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Product Information

Full details

The Roof Pro Black Roofing Waterproofer is an essential solution for homeowners and DIY enthusiasts looking to enhance the water resistance of their roofing surfaces. Its primary benefit is its robust ability to seal cracks and joints against moisture penetration, effectively preventing leaks and structural water damage. While it is highly effective for maintenance and exposed roof areas, users should note that its thick, black bituminous consistency requires careful, deliberate application and may not be suitable for surfaces where aesthetic color matching is a priority.

All features

ColourBlack
BrandRoof Pro

Extended Product Information

FAQs

Can I use this on a sloped roof?

Yes, it is suitable for sloped roofs, but apply in thin, even layers to prevent sagging before it cures.

Is this product paintable?

Because of its bituminous base, it is not designed to be painted over.

How long does it take to dry?

Curing time varies depending on the thickness applied and local temperature, but generally, it should be touch-dry within 24 hours.

What tools do I need for application?

A sturdy putty knife, a trowel, or a stiff brush are typically sufficient for most repair jobs.

Does it work on metal roofing?

It adheres well to most common roofing materials, including metal, provided the surface is cleaned of rust and dust first.

How do I remove it from my hands?

Use a specialized hand cleaner or a white spirit-based wipe; avoid using harsh abrasive materials on your skin.

Troubleshooting

Mastic is too thick to spread.

Warm the container slightly by placing it in a room-temperature area for an hour; do not heat with an open flame or high-heat source.

Mastic does not stick to the surface.

Ensure the surface is bone-dry and free of dust, grease, or loose debris. Use a wire brush for better preparation.

Product is running or washing away after application.

The surface was likely damp or the weather was too humid. Remove the wet product and re-apply once the surface is thoroughly dry.

Pros and Cons

Pros

  • Excellent water resistance properties
  • Provides a strong, durable seal
  • Easy to apply with standard tools
  • Ideal for emergency leak maintenance

Cons

  • Black color is highly visible on non-black roofs
  • Thick consistency can be difficult to spread in cold weather
  • Requires proper surface preparation for best results

Setup, Compatibility & Care

Before application, ensure the target area is completely dry, free of loose debris, moss, or oil, as these will prevent the mastic from bonding properly. It is recommended to use a stiff brush or scraper to clean the surface first. Apply the product during dry weather conditions; applying while it is raining or when rain is forecast will wash away the uncured mastic. Store the container in a cool, dry place with the lid tightly sealed to prevent the product from hardening prematurely. For personal safety, always wear gloves when handling bituminous products to avoid skin contact.

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