To prepare a 5% solids solution by weight, mix one volume of "Dri-Sil" water repellent with 14 volumes of mineral spirits. For example, if a 55-gal drum of "Dri-Sl" 73 water repellent is used to make a 5% solids solution, then 14 X 55 gal or 770 gal of mineral spirits would be required. Surface Preparation: The mortar in masonry should be allowed to age in service for about a month before silicone water repellents are applied. Certain types of concrete blocks have pores so large that silicone treatment will not keep out a driving rain. On such surfaces, a coat of cement-based paint can be applied to reduce pore size. The surface can be treated with silicone water repellent after the paint has fully cured.* Application: Repellents based on "Dri-Sil" 73 water repellent can be applied to masonry by brushing or by low-pressure spraying. The repellent should be applied liberally enough that it will run down 6 to 12 inches on the masonry; generous overlapping of passes is recommended. the repellent should
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