How to apply two part polyurethane waterproofing coating?

Two part polyurethane waterproof coating is a reactive moisture-curing two-component polymer waterproof coating consisting of A component and B component. The A component is a polyurethane prepolymer, and the B component is a water-based curing agent. upon application, the A and B components will be mixed thouroughly according to a certain ratio,  usually 1:2 or as design. the to be brushed on the surface of the construction after mixing, and cured into a continuous, flexible and seamless rubber waterproof layer through reaction.

The Application Procedures

Thoroughly clean the construction or working surface and is made free of any foreign materials;

Any cracks on the surface preparation bed is cut to V section, cleaned and filled with portland cement or other caulking materials or crack tapes. The surface must be neutralized by removing alkalinity through the means of acid application

Try to apply a polyurethane primer coating to the surface to serve as an adhesion coat. It is allowed to dry for at least 8 hours.

After the above procedures the brush-apply the 2 component polyurethane waterproofing coating after mixing as per design ratio. Each coat is allowed to dry for at least 12 hours before applying the next. Recommend to apply 2-3 layers to form a 1.0-2.0mm thickness waterproofing rubber layer

The PU coating is continued 150 mm up the parapets or walls. It should also be continued at least 100 mm into the rainwater pipes

The final Polyurethane coat is sprinkled with a layer of 300 micron of sand.

Post time: Jun-24-2021