National Shield Alkali Resistant primer is an eco-friendly, high quality special acrylic emulsion primer for masonry surfaces. It has excellent adhesion to the surface and has good penetrating property. It provides an excellent base for subsequent coats. It is a water based interior/exterior primer with excellent alkali resistance. It contains anti fungal and anti bacterial additives. RECOMMENDED USES As an alkali resistant penetrating primer for interior/exterior surfaces such as cement plasters, concrete and brick works. Prior to apply, suitable surface preparation is needed. National Shield Alkali Resistant Primer can also be used for surfaces like wood, asbestos, and gypsums. Highly recommended as an essential primer for National Shield series of topcoats. The surfaces should be dry and free from any contamination prior to primer application.