Pointing Mastic is specially formulated sand. When mixed with double boiled linseed oil it creates a thick putty used for joints between timber window and door frames and masonry or render.
Covers an area of approx 12.5 m per 1 kg (assuming a 9 mm joint).
Mix with double boiled linseed oil – 2.5 litres per 25 kg bag of mastic sand. Add oil a little at a time mixing until the mastic is worked in to a thick putty.