Skim plastering questions

[LJeff]

I've just filled an arched room opening with a stud wall and plasterboard. I have to skim the boards and match into the existing plaster a bonding undercoat which is around the edges of the opening.
In places I will have to skim more than one coat, because the thickness of plaster needed varies from 2mm - 7mm.
I'm intending to use multi-finish for the job, do I need to pva the existing bonding? Is it ok to build up skim coats and how long between skim coats?
I'd be very grateful for any suggestions or tips.

 

[jbonding]

give the whole lot of it a coat of bonding to straighten it up and skim, its sometimes easier to skim the full wall rather than patch up. if the bonding has been left for a while a coat of pva will help control the suction.

 

[LJeff]

Thanks for the advice, How long after the bonding coat before I can skim it?

 

[jbonding]

a couple of hours should be sound make sure you provide a key for the finish with a float with nails pertruding.

 

[hyde]

can anyone advise me on how to get clean edges from wall and ceiling corners without using a corner trowel as this tends to leave lines

 

[jbonding]

dont work to wet angles.