Plastering over Old Plaster - Do I need Bonding?

[subzero]

Hi

This may seem like a dumb-ass question but as a novice plasterer I am hoping to bravely skim over some old plaster at the wkd while missus is away.

Do I need to apply a coat of 'bonding' first or can I just get on with it?

Grateful for any advice and apologies if this has been asked before..

 

[PrenticeBoyofDerry]

If it's a plaster skim your applying,
the walls will need a couple of coats of PVA, one coat twenty four hours before the second coat, then when the second coat starts to go tacky apply your finish.

 

[subzero]

Thanks - that seems logical.

However the plasterer we used recently reskimmed an entire room (new plaster over old) within the same day so I wonder how he did this without bonding, unless it was some mega-quick setting stuff?

 

[troweladdict]

if your not that on it with plastering then id say get wba
wickes bonding agent get t on the night before
then just skim it
or better then that just score the walls with a knife 4:1 PVA mix
let it go say 40mins just enough time for a cuppa
the ad a little water to it say 5;1 mix PVA then get that on with a roller
nice and wet let it go tacky then skim it
please use muilti finish plaster as youll get the most time too play with it on the wall as its over old plaster then its just a reskim m8 peace of ****
just sheet up well m8 as it mite end up all on the floor lol
get the plaster from wickes too as its cheeper when you get 5 or more bags