Kölner Rapid is specifically developed for stone mason requirements. The adhesive is applied undiluted in two layers with a brush. After approximately 15 minutes of drying (depending on the thickness of the Rapid layer, temperature, and relative humidity), you can either apply a second layer of Rapid or you can start gilding. Beware that the Rapid layer must be completely dry before gilding. After that, you have three days open time to make a high-quality gilding.