... 2d1~3d1~7dW/P ratio0.180.180.20 Application InstructionsPreparationThe substrate should be clean, sound and free from loose material and ... contamination such as plaster, oil, paint and grease. The substrate should have a compressive strength of at least 20MPa and ... please refer to the technical support of Polar Bear.LimitationConcrete substrate onto which the self-levelling material is to be applied ...