Farrow & Ball Masonry & Plaster Stabilising Primer is a stabilising primer for porous, chalky and crumbling surfaces. On interior and exterior walls, the primer seals and strengthens the surface for excellent adhesion, so your paint bonds to a stable base. On indoor concrete floors, use the primer as a base coat under Modern Eggshell. This creates a solid, reliable foundation everywhere for a beautiful, long-lasting finish.