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How do painters paint inside on days of high humidity?

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  1. #1
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    Default How do painters paint inside on days of high humidity?

    Yesterday it was humid. Above 90% relative humidity most of the day (BOM data) and in the mid 90% RH all afternoon. But the painters did the ceilings. They say they did two coats of ceiling paint. There's no home heating system. And I didn't see any heaters or de-humidifiers in use.
    This morning the ceilings look very good, and at least touch dry.
    Is there some special brand of paint that contractors have for this purpose?

    It's similarly humid again today and the painters are hard at work on internal walls (double brick house) and all the wood window frames etc.
    (Paints are all water-based.)

    (I'm originally from Perth where there are plenty of dry days in a year, and I never painted my house if RH was more than about 70%.)

  2. #2
    Slow but rough Uncle Bob's Avatar
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    They put less water in it ;-)

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    2K Club Member toooldforthis's Avatar
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    with a beer in their free hand

  4. #4
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    Money is money, and plenty of standard 'professional' responses and little chance of reparations if issues arise down the track.

  5. #5
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    Quote Originally Posted by Uncle Bob View Post
    They put less water in it ;-)
    Well I'm pretty sure they didn't powder coat the place.

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    Another day, and today's weather forecast is high humidity, windy and rain, and the painters are still on the job.

    So is painting regardless of high humidity normal practice for commercial house painters?

  7. #7
    Community Moderator phild01's Avatar
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    I would paint inside my house today too (same weather as you), just keep the windows and doors closed. Do you have air conditioning with a dry setting, if so turn it on to dehumidify the air.

    Water based paints are a problem outside where the humididy can be more intense. Never paint outside upon sunset...by morning you might end up with paint all over the ground.

  8. #8
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    Quote Originally Posted by davewastech View Post
    Yesterday it was humid. Above 90% relative humidity most of the day (BOM data) and in the mid 90% RH all afternoon. But the painters did the ceilings. They say they did two coats of ceiling paint. There's no home heating system. And I didn't see any heaters or de-humidifiers in use.
    This morning the ceilings look very good, and at least touch dry.
    Is there some special brand of paint that contractors have for this purpose?

    It's similarly humid again today and the painters are hard at work on internal walls (double brick house) and all the wood window frames etc.
    (Paints are all water-based.)

    (I'm originally from Perth where there are plenty of dry days in a year, and I never painted my house if RH was more than about 70%.)
    Usually the recoat time will be extended from 1-2 hours in ideal temps to 5-6 hours,but provided ventilation is good,not a problem to 2nd coat same day.
    Any 'warmth' in the room will also be toward the ceiling.
    Cheers,
    Blocker.

  9. #9
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    Thanks Phild01,

    There are two small split systems, one in the kitchen and one in a small office. But nothing in the rest of the place.
    Actually when the painters left yesterday about 3:30pm I switched them both to high temperature and switched on a couple of exhaust fans, and had to leave the windows slightly open because the wood frames had been painted inside. Anyway needed to be a little bit open to allow the exhaust fans to work properly.
    I was considering using the aircon dry setting - basically that's cooling but it condenses the moisture inside the AC unit (and maybe some of the paint's co-solvent). Will this leave a permanent paint smell in the aircon?

  10. #10
    Community Moderator phild01's Avatar
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    Quote Originally Posted by davewastech View Post
    Will this leave a permanent paint smell in the aircon?
    No

  11. #11
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    Thanks Blocker and Phild01.

    We shall at least have two "dry" rooms. (And probably a bit of drying in two adjacent rooms)

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    btw re high humidity. What do you guys think about the practice of drying water-based paint on timber window frames with a hot air gun?

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    Quote Originally Posted by davewastech View Post
    btw re high humidity. What do you guys think about the practice of drying water-based paint on timber window frames with a hot air gun?
    Doesn't that normally help remove paint?

  14. #14
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    Quote Originally Posted by r3nov8or View Post
    Doesn't that normally help remove paint?
    Re: Hot air-gun. It's like love - you have to be gentle. But does it get the job done properly?

  15. #15
    Community Moderator phild01's Avatar
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    I wouldn't do it.

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