Primer for demanding substrates is an agent designed for strengthening and impregnating the substrate before the next phase of construction works, both for indoor and outdoor use. It can be used on all difficult substrates: old tiles, terrazzo, oil paints, OSBs, non-plastered brick walls, blocks, hollow bricks, concrete and anhydrite screeds, smooth concrete, gypsum plasterboards. It improves the adhesion of adhesives, plasters, waterproofing and putty compounds to surfaces with low absorbability, to extremely smooth substrates or covered with the residues of old PVC adhesives and paints. "Superkontact" special purpose primer is manufactured as a ready-to-use product.