I was taught to perimeter seal all boards holes etc to stop any air flow on external walls, iternals just fixed with dabs.
Been a long while since I've on site though.
That is a load of tosh from BG, I've done enough sand/cement work over the years and the finish should be applied when the sand/cement is still green to aid suction which a multi is, a low suction plaster.
Should have rubbed with a devilling float not a tilers trowel which allows no grip whatsoever.
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