First Coat: Prepare 3 parts sand and 1 part cement using the dilute No Hydro Salt Inhibitor solution.
Second Coat: The mix is as for the first coat except that water is used instead of No Hydro Salt Inhibitor solution. This is applied as a further 12 mm coat, giving a total thickness of 24 mm for both coats.
Final Coat: This should consist of a 3 mm layer of gypsum skim finish or similar finish. Other finishes are acceptable provided that they are porous.