Hi As a DIYer I've skimmed a fair bit of new plasterboard before and have made a reasonably good job of it. I've now got to skim a previously skimmed and tiled wall where removing the tiles has removed a little old skim in places where the tle dabs have pulled off the surface, and also left a raggy edge on to the corner bead, which is still OK. The wall is about 95% clean original surface and 5% craters. Not a huge area - round a kitchen window. What's the best way of preparing the old skim to re-skim over? PVA? What concentrate? PVA then dry or re-skim when sticky?
You are planning a complete new skim coat over everything? There's a stuff - what's it called? - Blue Grit or summat? Applied, it gives a good surface to skim on to. Never used it masel, but it sounds good.
Yes it's okay to skim that. If you do a mix of PVA and mix in some multi finish, paint it to the skim and allow to dry, this will give you a sand paper like finish as a good key, pva leave till tacky and skim the lot. B J
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