First Time Plasterer Seeking Advice

Discussion in 'Other Trades Talk' started by AndyF55, Feb 26, 2014.

  1. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    Sealant = sealant
    Bonding agent = for BONDING
    Bond-it = bonding agent(from thistle's site)
    PVA = Sealant and Bonding agent.

    I cannot say more.

    Mr. HandyAndy - Really
     
  2. BuilderMCR

    BuilderMCR Active Member


    I wouldn't bother saying more because your wrong...:D
     
  3. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    Those above are facts!

    Mr. HandyAndy - Really
     
  4. Please don't say any more...
     
    Sean_ork likes this.
  5. BuilderMCR

    BuilderMCR Active Member

    So plaster has to be glued on is what your telling me...
     
    Sean_ork likes this.
  6. Sean_ork

    Sean_ork Screwfix Select

    is there a full moon tonight ?
     
    BuilderMCR likes this.
  7. BuilderMCR

    BuilderMCR Active Member

    If I can't get hold of any pva then Andy I'll get a pritt stick. Thanks for the advice ;)
     
  8. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    No, that's not what I'm telling you. Not always.

    In the case of non-porous surfaces, yes.

    That is what bond-it does.
    That is what PVA does.

    In the case of porous surfaces, no.
    Prevent suction.

    That's what PVA does.



    Mr. HandyAndy - Really
     
  9. BuilderMCR

    BuilderMCR Active Member

    And for the people who want a quick bodge job get blue tack. It'll stick the plaster to the wall
     
  10. BuilderMCR

    BuilderMCR Active Member

    That's what I've been saying!! Suction control!..........

    It doesn't stick the plaster to the wall though. That's why you need some suction
     
  11. BuilderMCR

    BuilderMCR Active Member

    If you have no suction you have to provide a mechanical key (blue grit etc. )
     
  12. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    Don't take the p.

    Read the info on the websites. They say it. You seem to believe everything the manufacturer says, I'm just repeating it.

    Mr. HandyAndy - Really
     
  13. BuilderMCR

    BuilderMCR Active Member

    I don't believe everything the manufacturer says. If I did I'd be telling you not to use pva at all and use gyprime.
     
  14. Mr. Handyandy

    Mr. Handyandy Screwfix Select


    In the case of POROUS surfaces, yes.

    For NON-POROUS surfaces, you need ADHESION. There is no requirement for suction control here.

    That's why you PVA or Bond-it. For adhesion. There is no suction on non-porous surfaces.

    Mr. HandyAndy - Really
     
  15. BuilderMCR

    BuilderMCR Active Member

    And on porous surfaces it's the suction that creates the adhesion of plaster......
     
  16. Mr. Handyandy

    Mr. Handyandy Screwfix Select


    I'm glad you said that.

    So on non-porous surfaces, applied pva, what then creates the adhesion of plaster?

    Mr. HandyAndy - Really
     
  17. BuilderMCR

    BuilderMCR Active Member

    Put a piece of paper in a sieve

    The piece of paper is the new plaster

    The sieve is the old plaster

    Get a Hoover on the opposite side of the sieve

    You will see how suction works

    The piece of paper (new plaster) will be drawn towards the sieve (the old plaster) by the Hoover (the suction)

    This creating adhesion
     
  18. BuilderMCR

    BuilderMCR Active Member

    Non-porous surfaces (no suction) which is when you have to create a key by using bond-it etc.
     
  19. BuilderMCR

    BuilderMCR Active Member

    No try replacing the sieve with a bowl, this will be your non porous no suction background

    When you put the Hoover on the opposite side now your piece of paper (the new plaster) will not be drawn towards the Hoover because the no porous surface has killed the suction

    So this is when you use blue grit etc. to create an alternative key you wouldn't use pva on this type of background
     
  20. Mr. Handyandy

    Mr. Handyandy Screwfix Select


    Now line the sieve with pva and the bowl with pva.

    Then apply your paper(the new plaster). It sticks. Suction or no suction.

    It's called adhesion.

    Mr. HandyAndy - Really
     

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