Flash Harry Bitumen Mastic Trowelable Waterproofing Sealer 500ml
Flash Harry Bitumen Mastic Trowelable Waterproofing Sealer 500ml
Loot · checked 2 days ago
- Average
- R 223.00
- Lowest seen
- R 223.00
- Highest seen
- R 223.00
- Last change
- R 0.00
- First indexed
- 12 Sep 2026
- Retailer
- Loot
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.
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.
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.