On TV makeover shows you often see them leaving a few convector heaters
on overnight to dry out fresh plaster quickly. Is this bad for the
plaster like it would be for cement?
Would it make a difference if you were doing this to a skim of top coat
over an old wall or a new partition wall (fresh plasterboard, bonding
As long as you're only drying the air in the room, then putting heaters on
is OK, but don't point the heaters directly at the walls or you'll cause the
new plaster to shrink to quickly and crack it. De-humidifiers are the best
thing to use, because they remove the moisture into a bucket ready for
What happened to recycling? use that water to make new plaster... ad
Here we go - is it better to use electricity to extract that water
from the air, or to throw that water away and use fresh from the tap?
Answers on the back of self addressed postage stamp please... (in
order not to waste paper...)
It's import in the case of both cement and plaster that they remain
wet until they've set, otherwise they'll stop setting. Plaster sets
quite quickly -- I suspect it's reached full hardness within 24
hours. Cement on the other hand takes weeks to reach full strength.
I think you'd be OK as long as you let the plaster go off fully before
you start heating, or at least go off enough that you're happy with
the hardness as far as it's got before you start heating. Just a skim
on plasterboard wouldn't take long to dry by itself anyway. I would
avoid speeding up the drying unless you have some very good reason to
do so though.
You need ventilation too of course -- the water in all those bucket
loads of plaster has to evaporate and get out. (Actually, I assume
some is consumed by the chemical reaction, but I don't know what the
chemical reaction sequence is for gypsom plaster.)
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