On Mon, 28 Jun 2010 16:06:05 +0100, John Rumm
wrote:

I tend to buy multifinish - it goes over backing plaster or
plasterboard. Board finish may be slightly cheaper if just doing boards.

Thanks for everyone's replies. So board finish can only be used with
new boards then? If I wanted to skim over some already plastered walls
or boards would it not work as well? I was looking only to skim some
new boards but thought I might have skimmed an already plastered wall
if I didn't do too badly.