Flash Harry Bitumen Mastic Trowelable Waterproofing Sealer 500ml

Flash Harry Bitumen Mastic Trowelable Waterproofing Sealer 500ml is a heavy-duty, trowel-applied compound for sealing roofing defects and repairs. With a built-in membrane, this compact 500ml size is perfect for small, quick roof repairs and spot waterproofing of individual fixings and leaks.

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.
• Compact 500ml size ideal for small spot repairs.

Specifications

• Size: 500ml
• Type: Trowelable bitumen mastic waterproofing sealer
• Base: Solvent-based
• Membrane: Built-in
• SKU: A10383
• Barcode: 6009691023934

Typical Uses & Applications

• Sealing a single leaking roof bolt or nail hole.
• Quick patch of one cracked tile on a small area.
• Spot-sealing a gutter joint or downpipe connection.
• Touching up a short sheeting lap after a leak.
• Emergency repairs where only a small amount is needed.
• Keeping a handy top-up in the toolkit for roof call-outs.

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 fast, small-scale roof fixes.

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 500ml