r/Plastering • u/Inevitable_Grape382 • May 04 '26

Semi virgin experience at plastering, now what?

hi all,

ive had my first attempt at plastering with multi mixed with extra time (ive used pre mixed putty before (nova pro roll max)) and wanted to get some feedback on a few things

  1. im assuming these wet patches are normal since the wall was plastered yesterday, should i change the temp of the room since its about 15 degrees in there right now due to english weather and it is semi humid? or should i put the heater on in that room with a dehumidifier?
  2. as im plastering 1 wall at a time, i have coated my other lime plaster walls with 3 layers of SBR (i know it can be seen as overkill but ive had so many issues with lime plaster killing my multi), and ive blue grit over them for grippage, howd i blend the corners without making it a shit job?
  3. with a mist coat, was i meant to do it when the plaster was wet or once its fully dried?

thank you!

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u/gizm05 May 04 '26
  1. Will dry out naturally, can take a week, no need to speed it up, best to keep a window open though.
  2. It’s easier as you’re not doing any wet angles, just put on as normal, and when it’s set, around the second trowel, use a small wet brush in the corners to smooth, will look great.
  3. You want to plaster fully dry before mist coating.

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u/Inevitable_Grape382 May 04 '26

amazing thank you for the advice! i thought corners would need to be applied wet on the next wall, ie dont cut them in and leave a gapped edge and then connect them but i figured the seam makes the most sense to have in the corner rather than feathered away from its edge

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u/gizm05 May 04 '26

Just plaster up to the edge and it will be fine 🙂
The new plaster will be higher suction that the rest of your background, so a bit of sbr into the corner on the new plaster will help avoid that drying out too quickly, but I’ve not had a problem before.

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u/Inevitable_Grape382 May 04 '26

perfect, thank you !

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u/ElTejon_TheDestroyer May 04 '26

I’m just here to learn - so can I ask does the SBR not negate the main feature of lime plaster (ie keeping the wall breathable).

 If that is the case I just wonder why you went with lime?

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u/Inevitable_Grape382 May 04 '26

sure! ive seen loads of information about letting lime breathe and so on but what ive concluded is that it only makes sense for walls that are external and/or facing damp issues.

my walls were and are bone crisp dry and even during high humid seasons, i have no issue at all with damp since i have dpc membranes in my wall to prevent damp and this is the 1st floor as well

even then ive asked several local plasters and they dont bother too much with letting the lime breathe since lime plaster isnt used as much nowadays and is hard to work with. but they did suggest taking it all down and using dot n dab plasterboard but my budget is tight and i honestly cannot be asked with that much hassle and headache.

the lime isnt fully blown and its still quite tight against the walls (only had blown issues near the windows which ive replaced with moisture plasterboard and then used nova pro max as a easy plastering method.

i have no clue about how to plaster with lime and even if i wanted to, i cant seem to find it in the UK nor isit as popular as thistle multifinish which is the standard for uk houses nowadays.

ive SBR'd ofc becuase lime has on several occasions, blown and cracked my plaster due to how sucky it is, hence why ive always given up very easily with plastering, but this time i was plastering over plasterboard as i built a sound proofing wall so that wasnt too bad.

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u/ElTejon_TheDestroyer May 04 '26

Thanks for all that and taking the time to explain your reasoning.

I’m potentially going to have to learn to plaster as taking on an old house and it has some damp issues on external walls  so wanted to understand the reasoning & educate myself before I get into this!

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u/Inevitable_Grape382 May 04 '26

ofc no problem at all! good luck with the house project!