be used is 0 005 to 2 parts by weight per 100 parts by weight of the waterproofing sealer various other ingredients such as pigments plasticizers ultra violet inhibitors antioxidents and the like can also be utilised in the conventional amount the above mentioned chemical ingredients form a representative waterproofing composition which will be better understood by the following synthesis step 1 a waterproofing sealer composition of the invention is prepared by using a high speed mixer preferably with variable speed control one half of the weight of water is first mixed with preweighed quantity of selected polymer emulsion dispersion for 10 minutes sodium silicate is then added in a 35 solution form and the mixture is stirred for 5 more minutes step 2 concentrated solution of a siliconate or mixtures of siliconates 30 concentration is mixed with the other half of water for 5 to7 minutes to this the mixture prepared in step 1 is added gradually and it is further mixed for 5 to 10 minutes finally the additives are added to the solution under constant stirring for 5 minutes a typical formulation and its characteristics are given below in table 1 table 1______________________________________formulation by wt ______________________________________polyurethane dispersion 5 partsgrade 140aq u00ae milessodium methyl siliconate 5 partsgrade 772 dow corning u00ae orgrade r 20 union carbide u00ae sodium silicate grade n u00ae pq corp 0 1 partssurfactant surfynol tg u00ae air products 0 15 partsdemineralized water 89 75 parts 100 00 partscharactericstics appearance milky water solutioncured substrate appearance unchangeddensity lbs gallon us 8 55viscosity cps 20 40 waterlikeflammability non flammable______________________________________ to.