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  1. #1
    Join Date
    Jan 2008
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    Default Spraying water based Polyurethane

    I just finished a sunroom with Birch tongue and groove paneling.
    I want to spray a clear water base poly as it does not yellow as much as oil base.
    I am using a HPLV air gun.
    Does this need to be thinned and if it does what shall i cut it with?
    Harry

  2. #2
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    Default Re: Spraying water based Polyurethane

    You thin it with water if needed. Some polys need to be thined others don't. Wipe on poly is usually thin enough.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  3. #3
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    Default Re: Spraying water based Polyurethane

    Thanks all!!! this weekend I am going to give it a try. I'll have pictures
    Harry

  4. #4
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    Default Re: Spraying water based Polyurethane

    You might need to check the viscousity of the material to be sprayed. Usually sprayers will have a spec as to the viscousity value.
    Check this link : http://ronjoseph.com/Q&A/B1503_zahn_cup.htm
    "" an ounce of perception -- a pound of obscure "
    - Rush

  5. #5
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    Default Re: Spraying water based Polyurethane

    When applying poly by brush, it is thinned so that it is absorbed deeper into the wood for a stronger bond and longer lasting finish. While you may not need to thin the material for spraying purposes, I'd be inclined to do it for penetrative purposes. The polys I've used are usually thinned 25-50% for the first coat or two, then applied at full strength.

    Side note: STAY AWAY FROM MINWAX POLYS!!!!!! They do nothing but bubble and foam, and I'd suspect that spray application won't help matters any. Both McKloskies and General Finishes make an excellent poly.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  6. #6
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    Default Re: Spraying water based Polyurethane

    If you are going to use a water based product you should raise the grain before you sand.
    One reason to thin the WB poly is that it is so fast drying. Thinning helps prevent the droplets from forming a skin on their surface so they end up as a surface coat. I'm sure you've all seen furniture that you can run your thumb nail across and scrap off the finish.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  7. #7
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    Default Re: Spraying water based Polyurethane

    jkirk ... this wouldn't by chance have to do with the brother / real estate agent / project house does it ?
    "" an ounce of perception -- a pound of obscure "
    - Rush

  8. #8
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    Default Re: Spraying water based Polyurethane

    Sorry guys, but YukYuk is correct. For the clearest finish you should use high gloss for the sub coats and the satin or semi-gloss for the last coat. It's just the way it works.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  9. #9
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    Default Re: Spraying water based Polyurethane

    Quote Originally Posted by jkirk View Post
    ummmmm yes........ real estate agent got us a interior designer to pick paint colors, came through today, as bro was in line for varathane, i was in line for a 12 gauge
    LOL ...... you say that now but all will be forgotten when you're working on the next one.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  10. #10
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    Jun 2007
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    Default Re: Spraying water based Polyurethane

    Oh, by the way Raven, that really does look great.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

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