How to prepare the concrete base?
VPU 155S primer is ready to use, it does not contain solvents and creates a dust-free surface under the adhesive layer. Applied in two layers, a waterproofing layer is created - a vapor barrier. When applying with a roller, the consumption for the 1st layer is 150 g/m2, for the second layer (moisture barrier) 250 g/m2. Drying time for the first layer 30 to 45 minutes, for the second layer 2 hours at a temperature of 20 degrees C.
The consumption of VPD 130 is 120 g/m2 when applied with a roller. When using, before applying the glue, the primer is diluted with water in a ratio of 1:1. Drying time depends on the substrate. The use of a primer under STAUF SMP 930 adhesive does not improve the adhesive bond, however, it provides fixation of the surface and is desirable in cases where the surface is fragile and dust may form on the surface before laying.