On 12 Jan 2009 15:16:43 GMT, (Andrew
Gabriel) wrote:

Finish coat plaster is mixed up quite sloppy -- more sloppy
than you might imagine if you've not done it before.

In that case, mine was probably a bit too dry.

so it's difficult to help. Plaster shrinks as it sets (finish
coat particularly), so it will crack if applied too thickly.
2mm is probably about the safe limit for one finish coat.

Probably applied too thick too

Plaster doesn't make a good surface filler. Use something
like pollyfilla.

I have used a surface filler to fill the cracks, thanks.

Forgot to say it was Wickes multipurpose. BTW what stops their
premixed tubs from shrinking and cracking?