Mist coat woes on new plaster

[kristeva]

Hi all,

Just looking for some advice from any decorating experts on here please. I tried to mist coat some gypsum plaster the other day with Wickes Matt emulsion but reckon I might have c*cked it up!

I'm thinking I watered down the paint too much as I get a chalky residue on my fingers if I rub the wall in certain places. It can withstand the masking tape test easily, but if I rub hard enough it can also remove the paint completely in places (see poor quality photo)

Have I blown it? And if so how can I fix it - a wipe down or sanding and start again?

The room was plastered last year so good and dry. The instructions stated up to 40% dilution for fresh plaster (I think I may have gone 50/50). The instructions also stated to use the specialist mist coat emulsion for new plaster which is a bit contradictory.

 

[Mister Banks]

Interestingly there is a YouTube video complaining about how chalky Wickes matt emulsion paint is. Lookup Gosport handyman.

 

[kristeva]

Interestingly there is a YouTube video complaining about how chalky Wickes matt emulsion paint is. Lookup Gosport handyman.

I found it, yeah thats exactly the same stuff I used.

 

[JohnD]

Is it a vinyl emulsion?

 

[kristeva]

I think I'm going to make a complaint to Wickes. I'm going to have to rub the whole lot of with a sponge.

 

[kristeva]

Is it a vinyl emulsion?

No, doesn't mention 'Vinyl'. This is the stuff

 

[JohnD]

Non-vinyl emulsions are somewhat porous, so suitable for use on new plaster that is still drying out. The tradeoff is that they are not durable. It makes a new house look decent until the buyers move in. Once the plaster is fully dry it can be painted over with something better.

I notice your tub is marked "low washability"

And you have noticed it is not durable.

 

[JohnD]

I think I'm going to make a complaint to Wickes. I'm going to have to rub the whole lot of with a sponge.

Remist the bare patches and then give it an unthinned coat. It will even out the colour and absorbency and was cheap.

Then Paint over it with your preferred finish paint.

 

[kristeva]

Non-vinyl emulsions are somewhat porous, so suitable for use on new plaster that is still drying out. The tradeoff is that they are not durable. It makes a new house look decent until the buyers move in. Once the plaster is fully dry it can be painted over with something better.

I notice your tub is marked "low washability"

And you have noticed it is not durable.

I see, so this should only be used for fresh plaster that hasn't fully dried? I'll re-read the instructions but I can't say this was made clear.

I need a vinyl based product, back to the drawing board then.

 

[kristeva]

Remist the bare patches and then give it an unthinned coat. It will even out the colour and absorbency and was cheap.

Then Paint over it with your preferred finish paint.

Funnily enough John I thought about doing a 2nd mist coat and then an unthinned coat but I wasn't entirely sure because the instructions stated only 1 mist coat.

I just trialed a few of the edges with some unthinned paint - its still a little chalky but would this be ok to go over with a more durable finish?

Thanks

 

[JohnD]

Yes, but you must mist the bare patches first

If your mist coat was very watery, and has sunk into the surface so you can see through it, give it a second thinned coat with 10% water. You will know when you have sealed the surface because it will no longer suck the moisture off your brush.

 

[kristeva]

Yes, but you must mist the bare patches first

If your mist coat was very watery, and has sunk into the surface so you can see through it, give it a second thinned coat with 10% water. You will know when you have sealed the surface because it will no longer suck the moisture off your brush.

I'm wondering if I should do that 2nd mist coat with a proper vinyl matt. I'm still a bit worried about leaving this stuff on the walls though. Funnyily enough I'm not sure removing it will be veyr easy either lol

 

[CBW]

I used Wickes emulsion paint, in white - absolute garbage, too watery. Had 2 tubs, took one back for refund and bought some proper paint.