Sealer / primer for taped and jointed plasterboard

Discussion in 'Decorating and Painting' started by SALL2009, 23 Nov 2021.

  1. SALL2009

    SALL2009

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    I have used the taping and jointing method to finish my plasterboard walls. Just wondering what's the best options / products to get it ready to paint?

    Looking at few option (Zinsser Gardz, Dulux plaster primer, Zinsser Bulls Eye 123 Primer / Sealer)


    PXL_20211113_191943982.MP.jpg
     
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  3. RandomGrinch

    RandomGrinch

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    Hi,

    I don't know about the other products, but I have used the Dulux plaster sealer on a few taped and filled walls.
    I have always found it works well; it gives a good surface to paint over, without the filler turning to a mush when the paint is applied.

    ...but it looks as if you have the fun part of sanding it all, still to do!

    Good luck :)
     
  4. SALL2009

    SALL2009

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    That's a slightly older picture. Still need to finish sanding, but it's not as bad is in the picture, only need to smooth out any raised bits on the final layer.
     
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  5. opps

    opps

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    I would use Leyland Trade acrylic primer to spot prime the filler. It has the advantage of being easy to sand if required. It is also cheap.

    As much as I like Zinsser as a brand, I honestly don't see the advantage of paying over the odds for a Zinsser product.
     
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  6. RandomGrinch

    RandomGrinch

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    Good point, the Dulux is very good on a well finished surface, but attempting to sand it is not a good idea! :)
     
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  7. SALL2009

    SALL2009

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    If I use Leyland Trade acrylic primer to only prime the filler, doesn't the plasterboard itself not need sealing? Or should I just apply the primer to whole wall?
     
  8. RandomGrinch

    RandomGrinch

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    Bare plasterboard is a very nice surface to paint straight onto!
    You could prime the whole lot if you felt like it, but it's not strictly necessary.
    It might also depend on the colour and quality of the topcoat/s - if there's a chance of the filler and primer showing through.
     
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  9. opps

    opps

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    Plasterboard has a paper face and is able to accept emulsion directly. If you want a slightly flatter finish, you could spot prime the filler and then use another coat of the primer over the whole lot before sanding it with 180 grit paper to flatten the paper fibres. Most people don't bother though.
     
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  11. SALL2009

    SALL2009

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    How important is it to sand after the primer? I just want to use it as an undercoat all over the walls and then paint straight on top of that.

    Obviously I will sand and fix any imperfections that come to light, but really want to sand it all if I can get away with it.
     
  12. RandomGrinch

    RandomGrinch

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    The sanding of the primer wouldn't be anything like the work you have done sanding the filler!
    It's simply a couple of wipes over with sand paper; taking off any nibs of primer, or any fibres from the plasterboards paper surface, that have been brought up by the moisture of the primer.
    It's not completely necessary; but it will give a better finish, without a huge amount of extra effort :)

    ...you will probably find that the primer will show up any imperfections in your tape and fill. Be prepared for a bit of extra filling and sanding!
     
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  13. opps

    opps

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    As randomgrinch says, all that is required is a light sand. I recommended it because the paper finish otherwise will have a slight fibrous texture, the filler will be smooth.
     
  14. SALL2009

    SALL2009

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    PXL_20211130_165949575.MP.jpg

    Did first round of priming and happy with how it has turned out.

    I have one more question, I have more than half tub of 10 litre paint which has been open for around 2 years, but has been kept indoor. Would there be any harm in a few coats of that, before doing one final coat of my chosen finish (probably egg shell)
     
  15. opps

    opps

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    So long as it doesn't smell, it will be fine to use. You may need to filter it though. The paint on 10L tins often dries and falls in to the paint. I often purchase cheap tights to filter emulsion. Because of the level of suction, you may want to thin the first coat of waterbased eggshell very slightly.
     
  16. SALL2009

    SALL2009

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    The finish. Thanks for your advice guys!

    PXL_20211210_115837797.MP.jpg
     
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  17. RandomGrinch

    RandomGrinch

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    Lovely job! (y)
    Well done :)
     
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