Bondall Silasec is a concentrated liquid waterproofing compound designed to be used with Portland type GP cement to form a permanent waterproofing barrier on masonry and concrete structures and floors. Can be used above or below ground and for interior or exterior applications. Examples of uses include: fishponds and pools, weeping surfaces, concrete water tanks, septic tanks, retaining walls, concrete floors, waterproofing admix, renders above/below ground level and potable drinking water.