Concrete needs to be free from contaminats
Don't bother with BS8203 %RH way too high for kiln dried wood anyway!
Apply an epoxy surface DPM F Ball F75?
Neoprene Primer F Ball P131
WATER BASED Smoothing Compound 1bag for 5M2 F Ball Pink Bag
At this point I personally switch to Mapei P990 adhesive or sticking with F Ball B95
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