Always check the humidity of the substrate with suitable instruments. The substrate to be treated must be
compact and free of detaching parts and compliant with DIN 18356. Any surface defects,
such as fissures or cracks, they should be treated by mixing fine sand (not marine) with fine PRIMER WB PU
to obtain a homogeneous mortar.
Before applying, make sure there is an adequate vapor barrier.
Ambient and mix the product before use. Always check the compactness and humidity of the
screed (max 5 – 6 %).
Apply the first coat of PRIMER WB PU with a roller or brush. Leave to dry in a ventilated place at 45 - 55
minutes in suitable environmental conditions +15°C – 25°C and 50 – 70% RH (different conditions can lead to
less than excellent results or a variation in drying times).
If necessary, apply a second coat of PRIMER WB PU within 12 hours and, if applicable
of 1 leveling agent, spread some fine and dry quartz sand (not marine) on the last coat of primer.
Subsequently (after about 2 hours) remove excess sand before gluing which is to be
done within 24 hours.
Always use adequate individual protection systems.
Always consult the technical and safety data sheet of the product.