Hardwall/Bonding

by Simon
(Devon)

Hi, I have an old house and have a wall that needs plastering. I have chopped out old/damaged plaster and made some alterations. The wall now needs to be levelled with a backing cote before I use multi to finish. Some of the hollows are 10mm and some as shallow as 2mm.I want to raise as little as possible with a backing couat just enough to get a flat surface. Will hardwall or bonding be OK on such shallow depressions (2mm).

Thanks

Answer
Bonding coat will work the best!

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Can I use bonding coat in a bathroom?

Im currently renovating my bathroom and upon removing all the tiles 95% of the
skim coat come off with it, 50% of the backing coat also came off with it, it
looks to be sand and cement mix. The backing coat was extreamly soft espicially
around wet areas (Shower, bath and sink). Im going to remove the remaining
backing coat so i am going to end up with bare brick.

On the wall where all the backing coat had come off i started work and i have
used Thistle Bonding Coat this wall also includes a window.

Upon reading all over the internet some people are saying that you shouldnt use
bonding coat in a bathroom or around windows. Would you recommend to carry on
using bonding coat or start all over with sand and cement mix.

Thanks in advance for your help



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Bonding

by Simon
(Plymouth)

I have an old 1930s house and the original walls are sound but not flat. I intend to use bonding in small hollows of approx 2mm to 4mm and level with a feather edge. Then skim with 2 coats of multifinish as I feel the hollows are to much to skim without leveling first. Should I pva the hole wall before bonding or just the hollows and should I just feather and skim or should I scratch the bonding coat.

Answer
That all sounds good - I would apply PVA to the whole wall. If you skim after a period of time and the bonding coat has dried then damp down with water or PVA so as to try to match suction to the rest of the wall as near as possible. If the bonding coat is very smooth then scratch slightly.

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