Painted breeze block pva?

#1
Hello chaps,
Got some painted breeze block walls. Was gonna pva, hardwall and skim. Was wondering if i need to key the wall with something also and if bonding would be better? Thanks in advance. M
 

megamix

Active Member
#2
It will blow off . I would use blue grit then bond and skim or dab and skim .
 

zolco

Private Member
#3
As megamix says, grit then bond and skim
 
#4
If it gonna come off with pva it will with grit tooZ

Personally I’d try get the paint off. Or as much of it as possible
 

Mouldyoldspudgun

Well-Known Member
#5
If they are breeze blocks just smack it up with a scutch to give it a mechanical key then pva, bond and skim
 

Mouldyoldspudgun

Well-Known Member
#8
Mechanical key means fixing with screw and plug . Scratching the paint doesn’t mean mechanical.
Sorry physical key rather than gluing not sure you are right with that though, screwing and plugging is fixing not a mechanical key
 

megamix

Active Member
#9
Dab it then second fix it with nailable plugs (mechanical fixing ) to more or less guarantee it won’t fall off
 

Mouldyoldspudgun

Well-Known Member
#11
Mechanical key means fixing with screw and plug . Scratching the paint doesn’t mean mechanical.
It’s not scratching the paint either, it’s knocking little chunks out of the block to give a key unless that’s all your arm can produce with a scutch
 

megamix

Active Member
#14
It’s not scratching the paint either, it’s knocking little chunks out of the block to give a key unless that’s all your arm can produce with a scutch
I fully concur with you on that one . I’m right about the mechanical fixing though ;););););););)
 

Mouldyoldspudgun

Well-Known Member
#15
Dab it then second fix it with nailable plugs (mechanical fixing ) to more or less guarantee it won’t fall off
You are talking about a different system a mechanical key for two coat plaster is the scratch your sort of fixing is not second fixing I think you mean a secondary fixing
 

megamix

Active Member
#16
You are talking about a different system a mechanical key for two coat plaster is the scratch your sort of fixing is not second fixing I think you mean a secondary fixing
Yes i do . I misunderstood your first statement about mechanical key . I meant mechanical fixing not key . I apologise
 

Mouldyoldspudgun

Well-Known Member
#18
Key
The roughness of a surface which enables plaster to make a mechanical bond with it
That is from the British gypsum site book
 

Mouldyoldspudgun

Well-Known Member
#22
You can’t put unifinish on breeze block, well I suppose you could but rather you than me also British Gypsum says Unifinish CAN eliminate the use of PVA not does eliminate it just in case it falls off I guess. Happy new year Vincent
 

carlos

Private Member
#24
Brush hammer or needle gun as there sometimes called.

Bottom line get the paint off
 

satan

Active Member
#29
If it is gloss paint you could try a wall paper steamer stripper.
 

Danny

Administrator
#30
Hello chaps,
Got some painted breeze block walls. Was gonna pva, hardwall and skim. Was wondering if i need to key the wall with something also and if bonding would be better? Thanks in advance. M
Hardwall is for high suction backgrounds so that will be the wrong material.

I would be using a pregrit then bonding (wall will be low suction now) then skim
 
#31
Hardwall is for high suction backgrounds so that will be the wrong material.

I would be using a pregrit then bonding (wall will be low suction now) then skim
spot on Danny.....first sensible comment on here.

Hardwall is also not recommended for use over pre-grits.
 

essexandy

The Lake Governor
#32
Hardwall is for high suction backgrounds so that will be the wrong material.

I would be using a pregrit then bonding (wall will be low suction now) then skim
Basic knowledge isn't it Danny?
This place does attract some doesn't it.
 

beader

Private Member
#33
I would scratch coat of bonding then float with hard wall as i hate floating with bonding .
 

CeeVee

Well-Known Member
#34
Wall is already low suction.
Just bond the f**k*r or dot and dab.

I cant believe there are so many different answers!