Coating compositions and treating method

The present invention relates to an aqueous coating composition system for the treatment of cellulosic articles， which includes a first aqueous composition having a pH of at least 10 and comprises potassium silicate and a penetration aiding agent， wherein the potassium silicate is present in a range of from 1.5 to 32% by weight， the molar ratio of silicon (Si) to potassium (K) of said potassium silicate is 1.2-2.1; and a second aqueous composition comprising an emulsion of at least one alkoxy silane and/or siloxane compound. The present invention further relates to a method for treating cellulosic articles and uses thereof.