PVA for wood treatment sealant

Discussion in 'Carpenters' Talk' started by Grayson Lee, Nov 9, 2017.

  1. Grayson Lee

    Grayson Lee New Member

    Hi, I've screwed up!! I have used 3 coats of PVA on my new shed, thinking that it would provide a "belt n braces" sealant for the shed. The shed is pre-treated with PROTEK wood stain and protector (Gold). When it rains the whole external woodwork (t&g) turns white, ie the same colour when it was painted on. ? When it dries, the woodwork returns to its original gold colour. Question?: when the shed returns to its original colour (ie no white drips etc) what preservative/treatment can I paint on to stop the "whitening" happening again? I have some NO NONSENSE wood treatment (clear). Thanks for any advice.
     
  2. Dr Bodgit

    Dr Bodgit Super Member

    Gawd, that is a bit of a screw up, I have no idea what can be put on PVA. You might try white spirit, or pressure washing it.
     
  3. Bob Rathbone

    Bob Rathbone Screwfix Select

    The PVA will wash off with the rain and frost over winter. You will know when it's all off as the shed won't go white when it rains.
     
    KIAB likes this.
  4. Astramax

    Astramax Super Member

    PVA is not a wood sealer, you may try removing it in it's damp state with a pressure washer. It may be possible to paint over the PVA with Bedec Barn Paint as this is a waterbourne product but my advice would be to contact the Bedec paint technical department (Google Bedec for contact info) for accurate advise on it's adhesion qualities when applied over a PVA base.
     
  5. AlvyChippy

    AlvyChippy Active Member

    missed point! the "sealants", that are meant to be in such circumstances are "breathing ones", hence they stay on for way longer than any paint (not "breathing") and moisture (heat-cold- damp) causes paint to peel of, even with primer. Same principal, as in old facia's and soffits.

    Indeed, pressure washing now, let it truly dry out, then (ideally) sanding and only then, in accordance to instructions, use ONE coat once a year.
     
  6. KIAB

    KIAB Super Member

    [​IMG]

    [​IMG]
     
    Mosaix likes this.
  7. Wait until it's as wet as wet can be, ideally constantly wet over a few days so it's very soft and white, and pressure-wash it off as mentioned by Astra.

    That will also nicely remove the top layer of any preservative...

    When it's then as dry and dry can be, brush/spray it with Everbuild Lumberjack clear preservative and allow to dry.

    Then add something sensible...
     
    KIAB likes this.
  8. AlvyChippy

    AlvyChippy Active Member

    how can you sleep at night?
     
    Mosaix likes this.
  9. Isitreally

    Isitreally Super Member

    Leave it, you'll have one hell of a fly trap in the summer. :p:p:p:p
     
    KIAB and Deleted member 33931 like this.
  10. KIAB

    KIAB Super Member

    Everbuild Lumberjack clear preservative superb product.
     
    Deleted member 33931 likes this.
  11. Sis moved in to a hoosie last year which had green algae-encrusted fence panels. I recommended Lumberjack to try and make them last a bit longer, but didn't expect the transformation in appearance - the algae disappeared and the wood took on a beautiful clean silver hue.
     
    KIAB likes this.
  12. KIAB

    KIAB Super Member

    I do feel sorry for OP,but I wouldn't thought anybody would ever use PVA for preserving a shed,never of it being done before.
     
  13. KIAB

    KIAB Super Member

    It's non solvent, but does contain fungicides and algaecides in it, so will kill the algae.
     
  14. AlvyChippy

    AlvyChippy Active Member

    m8, just kidding ;)
    honestly this sort of "sealant" misunderstanding is one of the harder one's to put right
     
    KIAB likes this.
  15. KIAB

    KIAB Super Member

    I wish OP would post a photo of his white pva shed, as you'll probably never see another one.:D
     
    Mosaix likes this.
  16. AlvyChippy

    AlvyChippy Active Member

    :D :D :D
    gowd!
    now I'll be sleepless! :D
     
  17. Dr Bodgit

    Dr Bodgit Super Member

    It's an albino shed.
     
  18. Grayson Lee

    Grayson Lee New Member

    I've tried posting a picture but its too big and the forum server won't accept it.
     
  19. KIAB

    KIAB Super Member

    Make it smaller 2MP or less.:)
     
    Deleted member 33931 likes this.
  20. Nah, no excuse :)

    You need to reduce it to below 2MP. Or cut the shed in half.


    (Actually, don't post a pic, 'cos the image in my head can't possibly be beat. Especially after IIR's 'fly' comment...)
     

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