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I'm just quoting a reply from @Airhead from before which was about chased channels from rewire
It's not that difficult but you need smallish amounts of a few materials that come in larger quantities.
Hopefully your wiring is in some form of trunking possibly plastic, pinned into place so that it's easy to plaster over.
PVA the channel, mix up some bonding plaster (not multi finish), slap that in and roughly level it off, best if its a little below the surface but just less than proud is best.
Let the bonding plaster dry, 24hrs should do it if the central heating is working. Wash the bonding off the walls surrounding the channel with a sponge. Should now be clean walls.
Use some TX110 from toupret or similar if you have another filler you prefer. Fill the channel to flush. If you want a slight texture to match surrounding walls then get creative with a sponge. Let it dry a bit then sponge of any excess.
Paint with Gardz from Zinsser. Let that dry and finish with emulsion.
So you need pva, plastic trunking and some nails, bonding plaster, decorators filler & gardz
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rj
Currently replacing skirting board and found these areas of detached plaster by the front door.
What’s the best way to repair before the new skirting can be attached?
There’s also a noticeable draught coming through that I’d like to stop as well.
Expanding foam in the cavity to stop the draught followed by layers of filler?