What tips/advice for post treatment of liquid screed please? (Done by ScreedIt using locally sourced screed mix)   A google suggestions: http://www.bal-adhesives.com/tiling-onto-calcium-sulfate-anhydrite-screeds/   Laitance should be removed by light abrasion using a suitable sanding machine i.e. a rotary floor scarifier and a 60’s grit sandpaper. Remove excess dust completely with a vacuum cleaner. Abrading the surface is best carried out 4-6 days after the application