RC Impreg 400® is a ready made, high performing, colorless, waterbased waterrepellant for porous substrates (concrete, bricks, cementeous plastering, natural stone, roof tiles, …). The RC Impreg 400® is based on a mixture of different increasing molecular weight polymers offering an optimal and lasting waterrepellency effect. RC Impreg 400® is solventless, inflammable, odorless and can be applied to wet, dry or alkaline substrates- even fresh joints. This almost invisble after application product therefore respects the original aspect of the wall but shows a remarkable beading or lotus effect .