Long story cut short:
I need to lay* one coat plaster 50mm thick - how long would it take to
dry (roughly) or is it better to lay it in say a number of stages - say
5 stages of 10mm, or 2 of 25mm (whatever).
*It's being laid on a window sile to patch repair a section, then
Best to use "drywall adhesive" as the backing stage, as plaster is not a
good medium to work with in thick stages.
Dry wall adhesive can be put on thick and then skimmed with normal plaster
=======================The instructions on the bag suggest building up with layers of 5mm to 20mm
with a limit of 50mm so you would probably get away with 2 X 25mm if you're
in a hurry.
On the other hand it does take time to dry out fully. I would suggest that
you apply the first coat and let it go hard enough for you to apply the
second and then wait until it dries to a proper white colour before tiling.
That could be a few days in this warm weather.
Just use drywall adhesive and a bit of plasterboard dot & dabbed on top to
the finished level if it's going to be tiled. That way it will be set enough
to tile onto in a few hours when the adhesive has set.
Personally, I would make up mortar for that thickness, which you
could lay in one go if it's horizontal. You are probably looking
at many days for this to dry out, regardless if it's plaster or
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