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Thread: What to thin poly with???????

  1. #1
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    Question What to thin poly with???????

    I just bought a spray system and while does a good job a spraying lacquer and stains, it doesnt do good at spraying thick oil based poly. So what works best for thinning it? On hand I have, mineral spirts, DA, Lacquer thinner and Aceatone. Or do I need to buy something different?

  2. #2
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    From Fine Woodworking (for wipe on):

    Use mineral spirits to thin oil-based polyurethane
    by 20% to 30%

    I would assume a bit more for spraying but MS seems to be the recommended thinner. They also, oddly enough, voted Minwax wipe-on poly as the easiest to use with the best outcome. I say 'oddly enough' because I hear so many folks complain about Minwax(?).
    Last edited by glenn bradley; 12-05-2007 at 10:35 PM.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  3. #3
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    I agree with Glenn's response but I have a question myself.

    When I thin polyurethane with mineral spirits and store it in an air tight container in just a few days it will gel. Is that because I have incorporated too much air into the mix while stirring in the MS or some other reason?

    I still use a poly/oil/MS home brew on occasion and learned that I cannot make much more than I plan to use as it will almost certainly gel in a few days.
    I may be getting a little older physically but mentally I'm still tarp as a shack.

  4. #4
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    OK, I will give it a go. Like Mike I also have noticed that that when I rinse my brushes that had poly on them in ms it turns to a white colored gel.

  5. #5
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    read the can.......most manufacturers give thinning or clean-up instructions.
    often the "thinner" is listed as a "cleaner" because we all know that thinning finishes causes cancer in california rats and pregnant penguins.
    [SIZE="1"] associated with several importers and manufacturers.[/SIZE]

  6. #6
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    Tod, it says to clean with either paint thinner or minerail spirits. I thinned it 1 part ms to 2 parts poly. It laid nice and smooth and dried in enough to recoat in 2 hours.

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