How to tackle a red wall when going a different colour?

[Mr. Clueless]

Chimney breast.
Damp wall which was treated with Sovereign products & then plastered on top (just in case any of that matters).
I then painted it red.
I remember back when I did it it was an absolute nightmare. It took so many coats that I lost count. Certainly more than 5. I think it was somewhere in the 6-8 coat area to get decent coverage.
I used white primer as that's what I used for the other walls but I later learned that was a rookie error.
Paint used was some Crown paint of some description. I might still have the tin in the shed if I start digging to identify it but yeah that's as much info as I can think to give.

OH wants to change it to blue. She's specifically selected this one. I personally don't feel like changing it but she wont stop badgering.
I don't want her to do it as she makes a mess when painting (paint ends up on stuff it shouldn't) & doesn't clean up properly. I also don't want her paying someone, which is what she's on about doing. It's just a chimney breast. Maybe they wont charge too much but everything seems to cost the earth these days so I imagine I'd not be too keen on the price.

She insists that it's fine to just put blue direct on to the red. "It's just 2 coats" (why wont you do it).

Remembering the nightmare I had with red the last time round I want to check whether this is the case or not. Whether primer (assume grey?) needs applying first. Just the best way to be prepping & doing it. I don't want to do it at all but if I do it I certainly don't want to be spending more time on it than I have to.

Last time round there was no furniture in the room & it was bare floor. This time there's carpet & furniture so I need to faff around with covers too.

 

[opps]

3 coats of a decent emulsion (eg Dulux Trade matt emulsion) should suffice - cutting in might require a 4th coat.

As a decorator, I should have known better, nevertheless I once purchased a 10L tub of Crown (retail) white matt emulsion (it cost a tenner). I was only painting white walls. 3 coats of emulsion failed to cover slight scum marks. I threw the 99% full tin in the bin.

Years later, I worked for a mate. He had purchased the same paint. I warned him it was rubbish. To prove my point, I applied a coat. He agreed it was rubbish and binned it. BTW, if says Crown Trade, rather than Crown, it should be ok.

 

[Mr. Clueless]

3 coats of a decent emulsion (eg Dulux Trade matt emulsion) should suffice - cutting in might require a 4th coat.

As a decorator, I should have known better, nevertheless I once purchased a 10L tub of Crown (retail) white matt emulsion (it cost a tenner). I was only painting white walls. 3 coats of emulsion failed to cover slight scum marks. I threw the 99% full tin in the bin.

Years later, I worked for a mate. He had purchased the same paint. I warned him it was rubbish. To prove my point, I applied a coat. He agreed it was rubbish and binned it. BTW, if says Crown Trade, rather than Crown, it should be ok.

Just to check I'm on the same page here...

Are you saying 3 coats of colour should be fine - as in no primer required at all?

And if that's what you're saying then I assume you're saying bin the colour that she wants (link in OP) and go find as close a match as she can find that falls under the Dulux Trade umbrella (or possibly Crown Trade)?

 

[opps]

Just to check I'm on the same page here...

Are you saying 3 coats of colour should be fine - as in no primer required at all?

And if that's what you're saying then I assume you're saying bin the colour that she wants (link in OP) and go find as close a match as she can find that falls under the Dulux Trade umbrella (or possibly Crown Trade)?

Primer is not necessary in between coats of emulsion. The primer is only necessary when sealing the plaster for the first time (the primer can be a dilute coat of regular matt emulsion thinned as per the manufacturer's instructions and not some guy on youTube ((it reduces the level of suction))- note: do not use contract emulsion as a primer, it does not reduce the level of suction).

Blue in Dulux Trade or Crown Trade, 3 coats should be able to cover red. That said, you will need a decent roller. I use the Purdy Colossus sleeves. But be advised that profession rollers have a wider diameter than the toy diy ones. 1.5" versus 1.25". You don't need an expensive purdy roller frame, any decorators' merchant will be able to sell you a compatible frame.

 

[Mr. Clueless]

Primer is not necessary in between coats of emulsion. The primer is only necessary when sealing the plaster for the first time (the primer can be a dilute coat of regular matt emulsion thinned as per the manufacturer's instructions and not some guy on youTube ((it reduces the level of suction))- note: do not use contract emulsion as a primer, it does not reduce the level of suction).

Blue in Dulux Trade or Crown Trade, 3 coats should be able to cover red. That said, you will need a decent roller. I use the Purdy Colossus sleeves. But be advised that profession rollers have a wider diameter than the toy diy ones. 1.5" versus 1.25". You don't need an expensive purdy roller frame, any decorators' merchant will be able to sell you a compatible frame.

I know I have Purdy brushes (figured if I'm not that great then my equipment may as well be decent) from when I painted after we moved in. I forget the roller cage. I think it's possibly Wooster, or that might be the extension pole I bought for the ceiling. I'd need to dig it out & check.

 

[opps]

I know I have Purdy brushes (figured if I'm not that great then my equipment may as well be decent) from when I painted after we moved in. I forget the roller cage. I think it's possibly Wooster, or that might be the extension pole I bought for the ceiling. I'd need to dig it out & check.

Purdy rollers sleeves and frames are interchangeable with Wooster. I prefer the purdy frames with their own extension poles because they have a little button on the pole which allows you to push the frame on without having to manually wind it on. Sounds silly, but over the period of a day it can save 10 minutes (putting it on and taking it off - lunch breaks, etc ). Over a week or two(ish) it makes sense to pay the extra.

As a pro- my go to are Purdy or Wooster. Unfortunately, here in west London, you seldom see Wooster products. I suspect that the reps' ankle tags will not let them cross the Thames.