Quality of base coat?

[SJRSJR]

Hello

I’ve had a lot of plastering done and I want to make sure I get the painting right.

I plan to use Johnstones Perfect Matt colour as the top coat but was going to use a matt white mist and undercoat first.

Should the base coats be the same brand or at least a good quality paint (and does the dilution ratio depend on the quality)? Any recommendations?

The Perfect Matt is expensive so was looking to save money where I could but I don’t want to cut corners.

Thanks

 

[Wayners]

Read the online data sheet for Johnstones perfect matt on how to apply to plaster.
You can follow manufactures advice.

Another way is to use a acrylic primer undercoat from Johnstones and follow the data sheet advice.
Or
Use Gardz which is the easiest way however you will need at least 3 coats of emulsion over and at least 6 hours for each coat to dry. Gardz seals really well.

I wouldn't recommend using contract matt as a mistcoat. It's too dry and chalky but many recommend. It's a practice from years past and modern resins in quality paints don't like going over it.

 

[Leftum]

I wouldn't recommend using contract matt as a mistcoat. It's too dry and chalky but many recommend. It's a practice from years past and modern resins in quality paints don't like going over it.

See my pics in the other thread. I’m using acrylic primer on going

 

[SJRSJR]

Thanks for the advice.

So now I’m worried. Once all this is done I’ll be painting rooms that were initially done with Leyland Super Leytex, specifically because it was recommended for bare plaster and had high opacity. Is it going to blister and come off on the roller? If so will an undercoat of Gardz or acrylic primer work the same?

This is going to get expensive!

 

[Leftum]

Thanks for the advice.

So now I’m worried. Once all this is done I’ll be painting rooms that were initially done with Leyland Super Leytex, specifically because it was recommended for bare plaster and had high opacity. Is it going to blister and come off on the roller? If so will an undercoat of Gardz or acrylic primer work the same?

This is going to get expensive!

I’ve got the same concerns now!

 

[Wayners]

Re Leyland Super Leytex.
New plaster.

Yeah. New build houses take 6 months to dry out so builders use paints for new plaster that allow drying.
After 6 months you can sand and prime the builders matt and go over with a quality emulsion.

For older houses that have been skimmed the walls can be fully dry in 2 days. Especially in summer.

This needs a different approach. Gardz is so easy to apply as like water. Then on with your durable emulsion.

Just remember durable emulsions take longer to dry because of the resins and going over products like Gardz you probably won't get two coats on in a day.

 

[Notch7]

I wouldn't recommend using contract matt as a mistcoat. It's too dry and chalky but many recommend.

I tried that with a budget leyland paint -absolute shoite, it was almost transparent when it dried.



I ended up buying Dulux trade and watering down the first coat

 

[SJRSJR]

So I’ve applied Gardz to one wall to see how it goes on and works with the paint.

It’s so watery (and expensive) that I don’t think I’ll be using it on the ceiling. Instead I’ll do a mist coat with the Jonhstone’s Covaplus Matt.

The instructions say up to 10% water for a mist coat. That doesn’t seem much for a good quality paint but I don’t want to deviate from the instructions if that’s what’s needed.

Has anyone who’s used it got any thoughts? Thanks