However, in most cases it is not necessary to use a primer before you glue the levelled floor. For universal use on absorbent and non-absorbent substrates there is the R766 Multi-Purpose Primer. R766 Multi-Purpose Primer can be used in concentrated or diluted form. Due to the rapid drying, this product is ideal for renovation work. Henkel has an extensive range of levelling agents for every possible use: cement-bound in various layer thicknesses, for anhydrite, for wooden floors, industrial floors, under parquet, specially for renovation, or for big differences in level. Thomsit XXL and XXL Xpres both have very few chemicals (90% fewer chemicals than a traditional levelling agent). This means cleaner and healthier work.