Two-component, fast-drying and easy-sanding acrylic-based primer having the characteristic of filling and adhesion is used by adding 25 ml Fix Crystal Acrylic Hardener to 100 ml Fix Crystal 4+1 primer. Optionally, it can be diluted with 10-30 ml Fix Crystal Universal acrylic thinner. It is ready for sanding for 2-3 hours at 20°C, for 30 minutes at 60°C, and for 10-20 minutes at the short wave infrared dryer and dries completely after 24 hours at air drying.