What to use to dot and dab to this ?

[shd1970]

Can anyone confirm what I should use to dot and dab plasterboard to this wall please ?
I think they are thermal/thermalite blocks ‍
You can hopefully see the previous adhesive was light in colour and seemed really hard.
The blocks are soft and you can easily jab a screwdriver into them if that helps determine what they are

Also, I need it to be strong as I’m going to be hanging a radiator so where the brackets are fitted, I plan to do a solid line of adhesive vertically as I’ll be drilling through it eventually

Thanks in advance all

 

[Wayners]

Id use 4 to 1 watered down PVA on blocks. Will give you more time to work with it although the pros like the suction so don't use PVA.

Powdered board adhesive. Wickes and b and q sell

 

[shd1970]

Id use 4 to 1 watered down PVA on blocks. Will give you more time to work with it although the pros like the suction so don't use PVA.

Powdered board adhesive. Wickes and b and q sell

Thanks @Wayners

Something like this : https://www.diy.com/departments/driwall-plasterboard-adhesive-25kg-bag/35815_BQ.prd

 

[Wayners]

Yeah

 

[foxhole]

The rad brackets should to fixed to the blockwork , the plasterboard does not support them.

 

[shd1970]

Is this another alternative @Wayners

@foxhole - yes I’m aware and have some core fix fittings to use but as it’s dot and dab my plan was just to go belt and braces and just do a complete line of adhesive behind where the brackets will be
Overkill, but if I’m gonna need to buy a bag of adhesive, I might as well use more of it than less

Thanks both for your input

 

[Wayners]

You can stick wood on with CT1 and a couple off screws.
Plasterboard over