dj
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that's your problem, bonding/ browning is designed to be skimmed the same day, best thing to do is mix pva 3/1 with water and apply to the whole area, DO NOT MISS ANY AREAS,leave to set. coat it again and skim whilst still tacky. this method will kill any suction and should give you plenty of time. i would also recommend you use multi finish or board finish (british gypsum) not that wickes shiyte.
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