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Painting concrete walls

  • 07-04-2021 1:26pm
    #1
    Notch000
    Registered Users, Registered Users 2 Posts: 1,473 ✭✭✭


    Im thinking of painting a block shed internally that i recently acquired, its about 20 yrs build and dry inside. Do i need to prep the wall before painting ? or what sort of paint should i use. Im ust looking to brighten the place up. might get a electric gun too to speed thibig up. finish is not terribly important.


Comments

  • #2
    rob316
    Registered Users, Registered Users 2 Posts: 18,325 ✭✭✭✭rob316


    Notch000 wrote: »
    Im thinking of painting a block shed internally that i recently acquired, its about 20 yrs build and dry inside. Do i need to prep the wall before painting ? or what sort of paint should i use. Im ust looking to brighten the place up. might get a electric gun too to speed thibig up. finish is not terribly important.

    Rub of a wire brush will do fine. Water down the first coat of paint as it will soak up the paint very quickly


  • #3
    Notch000
    Registered Users, Registered Users 2 Posts: 1,473 ✭✭✭Notch000


    Soakage wont be an issue. I though it would need to seal the concrete in preparation prior to painting ?


  • #4
    Padre_Pio
    Registered Users, Registered Users 2 Posts: 5,387 ✭✭✭Padre_Pio


    rob316 wrote: »
    Rub of a wire brush will do fine. Water down the first coat of paint as it will soak up the paint very quickly

    Or a power washer if you have drainage and ventilation, 20 years is a lot of dirt and cobwebs:D


  • #5
    Uncle Pierre
    Registered Users, Registered Users 2 Posts: 1,590 ✭✭✭Uncle Pierre


    Had a short thread on much the same thing myself a few months ago: https://www.boards.ie/vbulletin/showthread.php?t=2058131949

    I just went for it in the end, with no great prep work. Took two coats of paint in most places, and went over it a third time in some spots. And all looks okay so far anyway, though I suppose only time will tell how it works out in the long run....!

    Only thing different from that earlier thread is that I found out a roller was more or less useless for the job. Ended up going with a brush all the way.


  • #6
    rob316
    Registered Users, Registered Users 2 Posts: 18,325 ✭✭✭✭rob316


    Notch000 wrote: »
    Soakage wont be an issue. I though it would need to seal the concrete in preparation prior to painting ?

    It will, the bare block will suck the moisture out of the paint on the first coat. Water it down, like 70:30 and that will act as your sealer/base coat.


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  • #7
    danoriordan1402
    Registered Users Posts: 701 ✭✭✭danoriordan1402


    Similar scenario for me, will be starting on a 10 year old block garage in the next week or so. Paint guy advised me to water down first coat as well. He advised using a roller but I noticed that Aldi have spray gun in this weekend, might give it a go - https://www.aldi.ie/electric-paint-spray-gun/p/803883456050200


  • #8
    Padre_Pio
    Registered Users, Registered Users 2 Posts: 5,387 ✭✭✭Padre_Pio


    danoriordan1402 wrote: »
    Similar scenario for me, will be starting on a 10 year old block garage in the next week or so. Paint guy advised me to water down first coat as well. He advised using a roller but I noticed that Aldi have spray gun in this weekend, might give it a go - https://www.aldi.ie/electric-paint-spray-gun/p/803883456050200

    The roller won't get into the cracks and pits on the block.
    I only ever use a block brush.

    Sprayer could be good though!


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