Hi,

I read here that out-of-date plaster was good for filling chases and
B&Q were selling out-of-date BG Thistle universal one coat plaster so
I bought that. It did the job but it seemed a bit grainy. Is that a
sign that I didn't mix it well or is it a side effect of it being out
of date, or is it just supposed to be like that (I was expecting
plaster to have a smooth finish?).

The universal one coat goes on white. The British Gypsum site shows
pictures of the bags but not the product on a wall.

I would like to try to plaster over a plasterboard. What plaster is
best for that? When I have hired a plasterer they have always used a
plaster that is almost brown when wet, that goes through various
shades of pink as it dries. What would that one be?

TIA