1.The waterproofing substrate should be clean and dry ,no dust ,oil and water.
2.Brush directly after stirring the material evenly ,and avoid stirring too much polyurethane with water at one time.
3.Brush the coating by 3 or 4 times ,and recommend that the thickness should be not beyond 0.7mm at per coating film.
After the first layer is curing ,do the second layer .And the second should be at right angle to the first layer.
4.If necessary,do the protection layer after the coating is cured.