View Single Post
  #4   Report Post  
Old February 25th 08, 01:22 PM posted to uk.d-i-y
diy-newby diy-newby is offline
external usenet poster
First recorded activity by DIYBanter: Oct 2007
Posts: 106
Default Is undercoat / sealer necessary for new plaster?

"somebody" wrote in message
In message , Steven Campbell
After having some plaster work done I thought there would nothing else to
but give the walls a few coats of white emulsion. However after the 3rd
coat, I can still see a difference of colour from the old plaster to the

I've still to do a couple of walls where there is old and new plaster on
same wall.

Is it worth putting undercoat on first? Would it make a big difference?

Also would it be worth while applying the undercoat to the walls I have
previously painted that the new plaster can still be seen?


You should apply a "****" coat first. So called because the paint has been
watered down so much it is as thin as ****.

Basically, first coat, any cheap old emulsion mixed approx 50/50 with

I've had luck with some rooms where one **** coat and one proper coat was
all that was needed, others needed a **** coat and two proper coats. (all
these rooms done by the same plasterer).

One thing I've never got away with though is plaster coving. Always seems
to need a gazillion coats regardless.


Think I heard mention a while ago about sealing the plaster first with a
50 - 50 mix of PVA and white emulsion.