How to Mix Concretal-Lasur for the Right Opacity Concretal-Lasur is a mineral stain designed to enhance concrete surfaces without masking their natural character. Because it works as a translucent system, correct mixing is essential to achieving the desired finish. Concretal-Lasur is supplied in two components: Part A – the pigment Part B – the fixative By adjusting the ratio of pigment to fixative, you can control the opacity of the final result, from subtle tonal variatio