I have cracks all around the edges of the plasterboard sheets in the ceilings throughout the house. The cracks are pretty wide - about 1mm. The ceilings are plasterboard with a skim coat and emulsion over the top, and the scrim tape is hessian (1950s house). I'm about to redecorate and want to sort the cracks out first.
It seems I need to tape (e.g. FibaTape) and use jointing compound. My question is whether it is ok to tape and fill over the paintwork or whether I will need to sand the paint off first?