Mist Coat on plaster

[The Central Scrutinizer]

I've just put a mist coat on a freshly plastered ceiling and i'm planning to put a second mist coat on but i'm not sure how long the first coat will take to dry?.
On google some sites it takes 24 hours others 2 hours so a bit confused.
I really want to do the second sometime today as i've got all the sheets out and it's a messy job.

'

 

[Kingfisher101]

Depends on the temperature of the room and ventilation surely?. I'm leaving doing this till the spring. It says on all the sites that the room temperature needs to be at least 10c and my house is cold.
It will be more that 2 hours because it needs to soak in seal and dry. I'd leave it a day. You will know if its done wrong because it will all peel off.

 

[gbb]

On the subject of plaster (and apologies, I have nothing to offer re the above post)..
I have a dry lined wall, formerly had a radiator on it which aeons ago, had been used to dry clothes. The damp got through and separated the skim a bit and has bubbled, eventually a small 'scab' has developed. The whole area is uneven through successive years of painting, papering, stripping paper, wear and tear etc etc
Can you re skim over paint ?
I'm wondering if it's worth getting a pro in to do that whole wall ?

 

[The Central Scrutinizer]

Depends on the temperature of the room and ventilation surely?. I'm leaving doing this till the spring. It says on all the sites that the room temperature needs to be at least 10c and my house is cold.
It will be more that 2 hours because it needs to soak in seal and dry. I'd leave it a day. You will know if its done wrong because it will all peel off.

Its not actually the whole ceiling.We had two skylights in the kitchen and both were leaking.I had a roofer in who i have used before who got up on the roof and took pictures of the skylights.They were in such bad repair we decided just to fill them in which was cheaper than having new skylights.
The roofer removed the skylights then replaced them with felt,batons and new tiles.Inside they put in thick insulation and plasterboard.
Anyway i've digressed!
I've left the plaster to dry for four weeks before putting the first mist coat on and as you suggested to err on caution and i'm going to leave it until tomorrow to put the second coat on.

 

[Electric_Andy]

I've always just felt the surface and gone from there. The first coat usually gets absorbed very quickly, within 10 mins. I then leave it about an hour before aplying the second coat. But it will depend on what you've used for the mist coat (watered PVA or diluted paint or specialist mist coat solution).

 

[Adam4868]

On the subject of plaster (and apologies, I have nothing to offer re the above post)..
I have a dry lined wall, formerly had a radiator on it which aeons ago, had been used to dry clothes. The damp got through and separated the skim a bit and has bubbled, eventually a small 'scab' has developed. The whole area is uneven through successive years of painting, papering, stripping paper, wear and tear etc etc
Can you re skim over paint ?
I'm wondering if it's worth getting a pro in to do that whole wall ?

As long as you rough the wall and give it some key you can skim over paint.If it was me I'd just re do the wall,but there again I'd be doing it myself.Patching up is only ever going to prolong the pain 😁

 

[Adam4868]

I've always just felt the surface and gone from there. The first coat usually gets absorbed very quickly, within 10 mins. I then leave it about an hour before aplying the second coat. But it will depend on what you've used for the mist coat (watered PVA or diluted paint or specialist mist coat solution).

Never used PVA for a mist coat...for plastering but not for the painting.

 

[CXRAndy]

I've just put a mist coat on a freshly plastered ceiling and i'm planning to put a second mist coat on but i'm not sure how long the first coat will take to dry?.
On google some sites it takes 24 hours others 2 hours so a bit confused.
I really want to do the second sometime today as i've got all the sheets out and it's a messy job.

'

It will dry very quickly if it's just a mist layer an hour or two. Has the plaster gone dry? Don't put too much paint on until plaster has fully gone off

 

[Adam4868]

I've left the plaster to dry for four weeks before putting the first mist coat on

It will dry very quickly if it's just a mist layer an hour or two. Has the plaster gone dry? Don't put too much paint on until plaster has fully gone off

If it's not gone off in four weeks we've got a problem !

 

[CXRAndy]

If it's not gone off in four weeks we've got a problem !

True, when you said freshly plastered, led to thoughts of day or so beforehand.

👍

 

[The Central Scrutinizer]

I've always just felt the surface and gone from there. The first coat usually gets absorbed very quickly, within 10 mins. I then leave it about an hour before aplying the second coat. But it will depend on what you've used for the mist coat (watered PVA or diluted paint or specialist mist coat solution).

Watered down emulsion

 

[raleighnut]

On the subject of plaster (and apologies, I have nothing to offer re the above post)..
I have a dry lined wall, formerly had a radiator on it which aeons ago, had been used to dry clothes. The damp got through and separated the skim a bit and has bubbled, eventually a small 'scab' has developed. The whole area is uneven through successive years of painting, papering, stripping paper, wear and tear etc etc
Can you re skim over paint ?
I'm wondering if it's worth getting a pro in to do that whole wall ?

I'd remove the plasterboard and start afresh.