"Mr Fuxit" wrote in message
oups.com...
However the stain block (water based) is still showing the colour through
after two coats.

As far as I am concerned, no water based stain block can be as
efficient as a spirit based one. A long, long time ago, I was taught to
use shellac knotting to prevent bleed-through, and the only reason I
now use Zinsser is that it is slightly paler, and can be used more
easily under one-coat paints.


I've just remembered that i've got a tin of Zinsser stain block, which says
on the tin "water clear up", which presumably means it's water based.

The actual product i've got is Zinsser Bulls Eye 1-2-3, which is a
primer/stain block thingey.