Wilko Stabilising Solution 5L seals and binds exterior chalky and weathered render surfaces prior to painting with water-based masonry paint. Dries in 16-24 hours. he contents of this can will cover approximately 30-40 square metres* which after 1 coat, is about the same width as 18 standard doors (**Approximate coverage depends on the surface of your walls, see the back of can for more details).