Help! Some cracks in Multi-Finish??

[srfeo]

Yesterday I filled in the chases that had cables in plastic oval that I made in the wall. I used multi-finish plaster. In general it went OK, but in some of them I have some small cracks that appeared after it started to dry? I have more cracks where I tried to fill in plaster that had come loose near the ceiling.

My process was to paint in 1:5 PVA:water a few days ago and let dry. Then before plastering I painted in 1:3 PVA:water and let it go tacky before filling the channels and repairing plaster.

I'm not really sure what went wrong. Did I use the wrong product? Any ideas? Do I just need to put another thin coat on top to smooth/fill the cracks? Thanks!

 

[Richard C]

It’s too thick; Multifuish is a just that, a finishing plaster which is only intended to be around 3mm thick. Use Bonding coat plaster over/in the chasses, leaving it 3mm below the surface & then skim & blend into the surrounding wall with Multifinish.

 

[srfeo]

Thanks, I've been reading and I think that it was the wrong product (like you said) and dried too quickly.

Rookie move, I'll just either pull it out if it doesn't harden properly and try again or try to finish it off with poli-fill and sand (there is nothing in the room so dust doesn't matter).

 

[srfeo]

Would it be better to take it out and do it again with bonding/hardwall and then multi-finish or level it up with easi-fill and sand?

 

[Richard C]

Would it be better to take it out and do it again with bonding/hardwall and then multi-finish or level it up with easi-fill and sand?

Personally I would dig it out & start again; I use bonding rather than Hardwall, it sticks better to the steel capping I always use in cable chases .

 

[roughcaster]

It looks more like some multi finish in amongst the cracks. Better to do it again. Give it a wet down and PVA before you fill next time, it'll slow it down.

Roughcaster.

 

[spongey]

dig out the multi then hardwall - leave just shy then apply multi