Video Waterproofing with heat reflection KOSTER 21

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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).

Koster 21 does not contain volatile organic compounds (VOC content = 0), is free of polyurethanes, isocyanates, and bitumen.
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