Mist coat inconsistant..

[bounce08]

We had two walls skimmed recently as they were in really poor condition but the other walls seemed okay - they had never been painted but had wallpaper on them which we removed.

I did a mist coat on all the walls (one coat) using a matt white with about 30% water 70% paint.

The newly plastered walls have come out fine, but the older plaster has come out patchy and thin (see pics).

The old walls were prepped by sanding lightly and washing down with sugar soap (as there was bits of paste still on the surface).

Any idea why this has gone like this? I intend to put 2 emulsion coats on top of these coats (not watered down) - it is Crown matt paint - will this be sufficient?

Untitled

• bounce08
• 13 Jul 2014
• 1

Untitled

• bounce08
• 13 Jul 2014
• 1

 

[Flyboytim]

Probably the old paste that has been absorbed into the old plaster is causing uneven permeability of the wall. The mist coat is primarily to kill the suction of untreated plaster - the paste is already stopping the mist coat from soaking in.

After two proper coats of ubdiluted emulsion, the walls should hopefully be adequately covered