Can I apply it in frost or rain?
Yes – that is its main advantage. Unlike a water-based emulsion, this solvent-based bitumen compound is designed to be applied where frost or rain would otherwise prevent coating. It is the go-to product for winter roof repairs when you cannot wait for a dry, mild spell.
What surfaces can I use it on?
It is suitable for mastic asphalt, roofing felt, corrugated iron, fibre cement, slates, lead, copper, tin and zinc. That makes it a versatile one-product fix for most common flat and low-pitch roof coverings, gutters and flashings on domestic and agricultural buildings.
Will it crack in the cold or run in the heat?
No. The compound is formulated to resist temperature extremes – it stays flexible and will not crack in cold weather, and it will not soften and flow in summer sun. That temperature stability is what makes it reliable as a year-round waterproof coating.
How do I apply it and what is the coverage?
Apply by stiff broom or brush directly to a clean, sound surface, working it well into laps, joints and cracks. Coverage depends on the porosity and texture of the roof; rough or absorbent surfaces use more, so allow extra on old felt or asphalt.
Can I paint over it?
Yes. Once cured it can be overcoated with a suitable decorative solar-reflective roof paint. A reflective topcoat reduces heat absorption and UV exposure, which prolongs the life of the coating – worth doing on roofs exposed to strong summer sun.
Is it the same as bitumen paint?
Yes – it is a bitumen-based waterproof roof coating, often searched for as bitumen paint or roofing tar. The difference from a thin bitumen paint is that this is a higher-build compound formulated specifically for all-weather roof repair and protection.
Do I need a primer?
On very porous or dusty surfaces a bitumen primer improves adhesion and reduces the amount of compound absorbed. On sound, existing bitumen or felt it can usually be applied directly. Always make sure the surface is clean, sound and free from loose material first.
Can I use it to seal a leaking flat roof?
Yes. It is widely used to seal and waterproof leaking felt and asphalt flat roofs, blisters, laps and around flashings. For splits, bed a reinforcing membrane or scrim into the compound for a stronger, longer-lasting repair.
