Seal leaks fast and protect exposed joins with Grunt Flashing Tape. This heavy duty self adhesive tape conforms to uneven surfaces, creates a long lasting waterproof barrier, and is ideal for quick fixes and preventative maintenance across roofs, gutters, and outdoor fixtures.
Why choose this tape
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Weatherproof seal that helps stop water ingress at laps, seams, and penetrations.
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Strong tack for reliable adhesion on metal, plastic, and painted surfaces.
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Flexible backing that moulds to contours, ridges, and fasteners.
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UV and outdoor ready for Australian conditions.
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Clean finish suitable for temporary and permanent repairs.
Common uses
- Sealing gutter joins, end caps, and mitres
- Flashing around skylights, flues, and vents
- Stopping drips at roof sheet overlaps
- Repairing small cracks in downpipes and rainwater fittings
- Protecting fasteners and exposed fixings from water
- General waterproofing on caravans, sheds, pergolas, and trailers
Surface compatibility
Works on most clean, dry, and sound substrates including coated metal roofing, painted timber, rigid plastics, fibreglass, and masonry that has been sealed. Not recommended for silicone contaminated surfaces or areas that remain permanently submerged.
How to apply
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Prepare the area. Remove dust, old flaking coatings, oil, and loose rust. Dry the surface thoroughly.
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Measure and cut the tape to length with a knife or scissors.
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Peel and stick. Remove the release liner as you apply, pressing the tape down firmly.
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Roll with a hand roller or the back of a cloth to eliminate air pockets and ensure full contact.
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Overlap adjoining pieces by at least 25 mm for a continuous seal.
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Finish edges with extra pressure. Avoid applying in rain or onto wet surfaces.
Pro tips
- For porous substrates, prime with a suitable primer and allow to dry before taping.
- Cold weather can reduce tack. Warm the tape and surface slightly to improve bond.
- Ensure water can shed over the tape rather than against the lap direction.
Specifications
| Brand |
Grunt |
| Product type |
Self adhesive flashing and sealing tape |
| Size |
50 mm width x 10 m length |
| Use |
Exterior and interior repairs, roofs, gutters, and general waterproofing |
| Application temperature |
Apply in dry conditions on clean and sound surfaces |
| Cleanup |
Wipe tools with mineral turpentine or adhesive remover as suitable for the substrate |
Frequently asked questions
Can I paint over it
Yes, most solvent based and acrylic paints will adhere. Test a small area first.
Is it suitable for potable water
Not intended for potable water contact.
Will it work on damp surfaces
Best results are achieved on dry surfaces. Dry the area before application.
