Bostik Plasterer's Stabilising Primer is green in colour for easy application and contains 20% recycled material. It can be applied over porous and non-porous areas to give a surface that dries evenly giving excellent adhesion and a faster, easier finish. It has been specially developed for preparing old walls prior to re-skimming and can be applied over brick, blocks, concrete, plaster, plasterboard and render. It stabilises problem surfaces including: well-adhered emulsion colour, wallpaper adhesive residues, old plaster/render, porous and non-porous surfaces