Air bubbles in multi finish plaster

Discussion in 'Builders' Talk' started by nigel_t, Oct 17, 2007.

  1. nigel_t

    nigel_t New Member

    I've recently skimmed over some plasterboard and I've been pretty pleased with the results.

    One small problem I've noticed is that in two seperate small areas there are what appear to be small air bubbles trapped beneath the plaster. What causes this?

    Thanks in advance.
  2. alwaysworking

    alwaysworking New Member

    Good question...I'm no expert, but I get this some times and I thinks its water bubbles?

    I'm sure someone else will correct me if its wrong...

  3. nigel_t

    nigel_t New Member

    I was unsure if it was some kind of contamination on the plasterboard or if i'd mixed the plaster too much.

    Hopefully someone can help?
  4. Raman

    Raman New Member

    Had the plasterboard got wet beforehand?
    sometimes the paper comes away from the infil
  5. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    Did you give it a quick mix-up every now and then ?

    If so, you may have created bubbles that didn't have time to settle.

    Mr. HandyAndy - really
  6. I've got a theory on this... Occasionally when i plastered i would get the air bubbles coming through and it was a mystery. last summer i did some plastering for my dad and got him to mix it up with me, he was on the drill and kept lifting it in and out of the mix... not the way i do it but i left him to it. started putting the mix on the ceiling and had shocking probs with the bubbles. next mix told him to leave paddle in the mix as he stirred, and a perfect mix going onto exactly same surface, no bubbles at all.
    cocnclusive evidence, its air getting mixed in with the plaster so keep the paddle low, ( a taller, narrower bucket makes this easier). If you do get the bubbles there is very little you can do about them. don't waste time trying to get rid of them at the start, focus in the rest of the wall and have a go with a sponge near the end.
  7. nigel_t

    nigel_t New Member

    That does make sense, I do lift the paddle out of the mix and push it back to the bottom again. Its wierd it's only happened in two small patches. I'll be mixing again this weekend hopefully, so i'll post back if it's any better.

    Cheers, Nige.
  8. sammy toaster

    sammy toaster New Member

    hard troweling too soon.
  9. nigel_t

    nigel_t New Member

    Sammy, is that definate?
  10. sammy toaster

    sammy toaster New Member

    yup, the mixing problem is different, "babys heads" are caused by adding water to the mix.
  11. nigel_t

    nigel_t New Member

    Cool, i'll try that as well!

    Thanks for suggestions!
  12. Tony Soprano

    Tony Soprano New Member

    yes i totally agree with sammy ,you are trowelling too hard a bit too early,just flatten everything off and leave ,when its almost touch dry hard to explain the exact moment,then go for the finish,
    With ex[experience i am sure this problem will be eradicated
  13. nearnwales

    nearnwales Member

    was it all plaster boards or was some of it bonding or hardwall ? or may be some dry line adhesive ?
  14. Maverick!!

    Maverick!! New Member

    You're troweling it too much mate. Put it on and leave it for a while. The plaster is trying to stick to the boards, but your actions of too much, too early troweling, is loosening it from the board.

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