Koster 21

Koster 21 is a 2 component, solvent-free, liquid applied, elastic, crack bridging waterproofing material with excellent adhesion to dry and moist substrates.

Koster 21 is liquid-applied and seamless, which greatly eases application to complicated architectural details. 21 seals against synthetic oils and aliphatic hydrocarbons with high boiling points (up to 2 bar).

It does not contain volatile organic compounds (VOC content = 0), is free of polyurethanes, isocyanates, and bitumen.