Painting Over Conti Board

Whilst doing a bit of touching-up, I discovered that the genius who extended my front hallway used white conti board to line the inside of the walls and then plastered over it (for god's sake, why?)
A bit of sanding has revealed some of the white board and I need to cover it up. Now if I start to key it using a sander, more and more will get revealed as the plaster doesn't stick to it very well and I'll end up doing the whole damn wall.
However, if I can paint over it I can make the best of a bad job (ideally, I'd put a thin layer of some plaster-like material). But emulsion isn't going to be too keen to stick to plastic.
Can anyone help with a suggestion for something to go over the contiboard first?
Thanks
spog
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Hi Spog,
Heavy duty lining paper applied with a watery paste mix to allow it to stretch. Once it dries out, it should tighten up enough to cover the pretty bad blemishes. Wallpaper paste seems to stick to Conti-Board if memory serves correctly and paper is always a good base for paint.
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