Prepare
Remove loose or flaking material. Treat surfaces affected by mould growth with a suitable fungicidal wash. Make sure the surface is clean (no dirt or grease) and dry.
Apply
Apply 2 coats with a brush or roller, leave 6 hours between coats. Do not apply in very damp or humid conditions or extreme temperatures. TIP: if the colour change is strong, more coats may be required. If you use more than one can, mix them together in a large container or finish in a corner before starting a new can.