You should not need to "key" the browning, which should be smooth
when finished, but not polished. Are you allowing the PVA to dry
before you apply your finish coat? That may be a problem, if
combined with over-working the finish. You only need to get the
finish smooth, not looking as if it's been glazed!
If the plaster doesn't go off too quickly, taking over 1/2 an hour,
say, it should be fine. If it's still soft after 5 days something
is wrong with it!
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