Damaged plaster around switch

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Bonding & skim are a "professional" plaster - it's what plasterers themselves use.

Polyfilla is more of a crack filler- you have to apply it in thin layers so it can dry, whereas the bonding you can apply in one go, wait for it to dry then put finish on top.
 
last question. Do i have to leave the 1mm gap, ive saw plasters just chuck it on?

Do i have to rub it down after the first and last coat?
 
breack away old stuff mix a little plaster from small bag fill hole when it dries (it will crack) mix a little more and go over again with trowel - been a plasterer for 2o years and cant believe people would mess on with bonding/browning for such a small patch
 
To avoid this problem again - some advice........

DON'T USE A PNEUMATIC DRILL TO CHASE OUT WALLS!!!
 
If the bonding & skim are applied correctly and floated off, there will be no need for rubbing down.
 
Isolate and remove the switch.

Knock out any loose plaster.

Due to its depth, you need to fill the holes with undercoat plaster otherwise known as browning. This is very light and sticks to the wall, and can be quite thick. Because it is light, it doesn't pull itself out of shape.

Whap it in and smooth it down to just below the level of the wall. It will dry in a couple of hours.

Finish off with some plaster for a nice smooth finish.

It should be ready for refitting the switch the day after.

If you use just plaster or polyfilla, you will spend ages putting thin layers on then waiting for them to dry.
 
breack away old stuff mix a little plaster from small bag fill hole when it dries (it will crack) mix a little more and go over again with trowel - been a plasterer for 2o years and cant believe people would mess on with bonding/browning for such a small patch

What kind of plaster in a small bag are we talking about? Can't believe that a plasterer of 20 years would not use Bonding/Browning undercoat plaster to fill up a plaster patch onto brick/blocks regardless of size. I would use nothing else. It is so much easier,and made for the job. Wet 'n' PVA the patch before it's plastered and it wont even crack once,let alone have to go over it twice, just apply the finish when it's set. The patching here, to be honest should have been done first, not after the electrics were fitted. easier job, less work involved.

Roughcaster.
 

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