• Multi-purpose trowel grade mastic
• For waterproofing, stopping, bedding, pointing and sealing
• Suits general building and roofing applications
• Trowel-applied for awkward repairs and wide gaps
• Flexible, weather-resistant finish
• Available in 1 L, 2.5 L and 5 L

First, make sure the surface is clean and reasonably sound. Remove loose material so the mastic keys properly.

Next, work the mastic into the joint, crack or lap with a trowel or filling knife, pressing it well in.

Then shape and smooth it to shed water, building up in layers on deeper repairs.

Finally, leave it to skin and cure. It is ideal for bedding, pointing and waterproofing repairs on roofs and general building; for brush-applied waterproofing see our Seal It liquid membrane or bitumen paint.

• Product codes: BDB011 (1 L), BDB012 (2.5 L), BDB013 (5 L)
• Type: multi-purpose trowel grade mastic
• Uses: waterproofing, stopping, bedding, pointing, sealing
• Applications: general building and roofing
• Application: trowel or filling knife
• Sizes: 1 L, 2.5 L and 5 L

What is trowel mastic used for?

Waterproofing, stopping, bedding, pointing and sealing in general building and roofing work. It is a thick, trowel-grade material for repairs where a gun-grade sealant would be too thin.

How do I apply it?

Work it into the joint, crack or lap with a trowel or filling knife, press it well in and shape it to shed water. Build up deep repairs in layers.

Can I use it on a roof?

Yes, it is designed for roofing repairs such as bedding, pointing and waterproofing, as well as general building work.

What sizes are available?

1 L, 2.5 L and 5 L, so you can match the quantity to the repair.

Is it flexible once cured?

Yes, it cures to a flexible, weather-resistant finish suited to the small movements in roof and building joints.

How is it different from a liquid membrane?

Trowel mastic is a thick material worked in by trowel for joints and localised repairs. For coating a larger area, a brush-applied product such as Seal It liquid membrane or bitumen paint is better.