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Anhydrite screed prep
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[QUOTE="Silane, post: 985129, member: 58964"] A simple question I'm struggling with. Up front, it's a self build - my 4th, so done a fair bit but 1st time using anhydrite. Screed down for 4 years+. Prepping for ditra. Started sanding with 40 grit using 6"festool orbital to remove laitance - solid - (so may have to use diff tool). Issue I have - surface (when sanded with 40 grit) is a tough mushroomy colour - I can see whitey/ creamy colour aggregate beneath it where the air bubbles have burst. Before sealing do I need to take off top mushroomy coloured surface to reveal agg beneath? - Mushroomy surface is solid and we'll bonded to agg beneath - hard to even scratch it with screwdriver - my common sense brain is telling me that primer will bond well with top surface as is - so why remove and expose the more fragile agg beneath. Appreciate your thoughts Si [/QUOTE]
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Anhydrite screed prep
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