Flash Harry Bitumen Mastic Trowelable Waterproofing Sealer 1 Litre

Flash Harry Bitumen Mastic Trowelable Waterproofing Sealer 1 Litre is a heavy-duty, trowel-applied compound for sealing roofing defects and repairs. With a built-in membrane, this 1 litre size is a practical choice for medium roof repairs and waterproofing around fixings, laps and gutters.

Key Features

• Trowel-applied heavy-duty compound for roofing repairs.
• Built-in membrane that removes the need for a separate membrane.
• Versatile sealing of screw bolts, nail holes, sheeting laps, valleys and gutters.
• Solvent-based and effective even when rain is imminent.
• Overcoatable with Alu-Coat Silver in UV-exposed areas.
• Easy cleanup with thinners, solvent or petrol.
• 1 litre size suited to medium patch and repair jobs.

Specifications

• Size: 1 Litre
• Type: Trowelable bitumen mastic waterproofing sealer
• Base: Solvent-based
• Membrane: Built-in
• SKU: A10382
• Barcode: 6009691023927

Typical Uses & Applications

• Sealing roof screw bolts and nail holes on corrugated and IBR roofs.
• Patching sheeting laps where sheets overlap.
• Repairing valleys and gutters prone to leaks.
• Sealing around downpipes and roof penetrations.
• Fixing cracked tiles and small roof defects.
• Urgent repairs before rain where solvent-based cure helps.

Usage Tip

Clean the area of dust and loose material, then trowel the mastic firmly over the defect, working it into the joint. In UV-exposed areas, overcoat with Alu-Coat Silver for added protection, and clean tools with thinners or solvent. Take fire precautions, as it is flammable when wet.

A dependable, membrane-backed seal for keeping roofs watertight.

About FLASH HARRY

Flash Harry offers practical building and waterproofing products aimed at fast, effective repairs for contractors and homeowners alike, formulated for real-world roofing and sealing jobs.

What’s in the box:
1 x Flash Harry Bitumen Mastic Trowelable Waterproofing Sealer 1 Litre