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No need to sand before mist (at least, none of the plasterers I've had in did). Mist, fill, sand, maybe go over any larger filled areas again, paint.
Don't know about vinyl emulsion though.
Edit: Google says no to vinyl for a mist coat.
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Not needed for a key, but worth running a RO type sander or a big flat sheet over it to knock off any small dross thats latched itself on there. Easier to spot once its got a guide coat/mist of paint on it any defects TBH.
Fixed a 140 year old wall recently that I thought for sure was a gonna. Utterly done with having to rebuild every single wall I come across so thought I'd try chemically stripping the old wall paper gunk, chipping off the CEMENT that had been used to fill the bigger patchs, then in the loose areas just flaked them out, tied back to lathe, bonding and rebuild with minimum materials. Paint, easifil, sand, repeat until good. 1 day = 3 decent sized walls saved and looking as good as when they were laid in 1880. Instead of around 3 days of effort to strip back and rebuild in modern materials.
Tip, buy a desiccant dehumidifier, makes working in winter warmer, makes working the rest of the year a lot drier = materials dry like they say they do on the tin, not half a week like it ends up being in the 80% RH that UK seems to have all the time.
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stevo_com
BrickMan
@dst2
Ok painters and decorators. If the plastering is a good job do you sand before the mist coat to key the surface then fill before the 1st proper coat? Or can I just do the mist coat first then any repairs/sanding? What grit....is 120 too course?
Also, do I really need a contact emlusion to water down for the mist or can I use some vinal emulsion I have knocking around?