Bitumen Cold Joint Sealer / Bitumen Spray. Suitable for tarmac, roofing, gutter repairs, and also as a tack..What the expert sayThis is an excellent product that increases the durability of tarmac repairs, it seals against moisture and frost. Perfect for filling small gaps and sealing gutters..Bitumen Sealer is an applied cold joint sealer for easy sealing around vertical joints. .Vital to the performance of your work, edge sealing is a mandatory requirement for the Reinstatement of the Opening of Highways. .Ideal for use when carrying out road pothole repair as it creates a solid adhesive bond between the concrete and asphalt surfaces. .Seals against moisture.Increases the durability of tarmac repairs.fills small gaps and seals gutters.