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How to: polycell finishing skim on bare plaster

Discussion in 'Plastering and Rendering' started by efunc, 5 Dec 2020.

  1. efunc

    efunc

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    Hi all, this product says to ensure the surface is clean and dry before applying. In my case I've got patches of bare plaster where I've removed the paint and want to match the level before repainting. I've also got a section of completely new plaster that I want to smooth a bit before mist coat and paint.

    Are the instructions correct? Will the plaster suck the water out of the polycell finishing skim, or is it OK to use on the bare plaster? Would it be better to spray a bit of water on first? Or even do a mist coat of paint, and then the finishing skim?

    Thanks!
     
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  3. what paint surface are you trying to blend to , matt or silk?
     
  4. efunc

    efunc

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    The surrounding paint is vinyl silk. I've sanded it with 180grit and will use zinser bullseye 123 primer before painting my final matt emulsion over it
     
  5. efunc

    efunc

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    Here's the areas where I've scraped away loose paint:

    [​IMG]

    [​IMG]

    [​IMG]

    And this is completely new plaster:

    [​IMG]

    And there are defects I want to fill/smooth where the plaster has left trowel marks and scour lines:

    [​IMG]
     
  6. lostinthelight

    lostinthelight

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    I would sand the new plaster it will improve things and save a lot of filling .
    Did the person, not a plasterer I would suggest, remove the switches before skimming because its cr@p around there?
     
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  8. efunc

    efunc

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    I agree, I paid a 15yr veteran plasterer to do it, but he didn't remove the switch. I didn't notice the scour marks under spotlights, but the following day in natural light it cast a shadow and I saw it right away. I've been sanding with 180g but I've just switched to 120 grit and it's making better progress. I'm worried about going too far though so I'm might stop and fill what remains.

    So, is my Polycell Finishing Skim OK to use on this bare plaster without prep? Or should I either dampen the plaster first, or apply a 50/50% watered down mist coat of paint first to prime it?
     
    Last edited: 5 Dec 2020
  9. i’d seal the bare plaster first as it is with a weak watered down matt.
    then id give it 3 heavy roller coats of white matt, leaving it to dry thoroughly between coats. then you’ll know what your up against and can fill straight over the bits you dont like and rub it back , before your top coat.
    if you dampen the painted scraped bits though it may loosen more paint.
     
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  10. removing switches ,sockets and radiators is alien to most plasterers.
     
  11. efunc

    efunc

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    Thanks, good advice, I'll do that.
     
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