Toupret Humi Block is a specialist damp-control coating engineered for porous and untreated masonry. Its water-vapour permeable formula allows substrates to breathe whilst blocking moisture penetration—essential for cellars, basements, and problem damp areas. Apply to damp or raw surfaces using brush or trowel at 1.5mm thickness. Suitable for interior and exterior use, it can be painted over once cured. Follow technical guidance carefully before application.