From Calder
Calder flex Primer quality solvent acrylic based coating that gives a roof long term waterproofing protection with added fibers that interlace to cover up small gaps or cracks.Crazed Areas:These should be primed with Calder flex Primer prior to the application of a coat ofCalder flex Waterproof Roof Coating. Suitable for patch repair/all over roof coatingAvailable in:Standard Colour White