This Torch On Membrane Prime is a solvent-free, single-component waterproofing primer for torch-on bitumen membranes. Ready to use and easy to apply with a brush or roller, it forms a thin, flexible, and elastic film that seals porous surfaces, binds dust, and improves adhesion. With high elongation to withstand cracks up to 2 mm, it’s ideal for concrete or masonry roofs, terraces, balconies, and other membrane applications. Each 20 kg pail covers 200–300 m², offering safe, durable, and environmentally friendly surface preparation.