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  1. 21st April 2017, 08:23 AM #1
    yvan
    yvan is online now SENIOR MEMBER
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    Default Cloudy Polyurethane...

    I just finished assembling the frames I made for a mobile trolley to carry my printer and decided to apply 3 coats of 50:50 polyurethane/turps before assembling the lot together. The frames are made of 42 x 19mm DAR radiata pine and were sanded from 120 to 320 grit before the 1st coat.

    First coat was applied with a brush and was absorbed "immediately"and left to dry 24hrs. I did not sand this first coat.
    As an experiment, I applied the second coat with a clean, lint-free pad, to see if the application would be easier than using a brush, and let it dry 24hrs. As I tried to sand that coat, I found it was still tacky and "oily". I had a look at my 50:50 poly/turps mix and noticed it was cloudy.

    I can't figure out why it would be cloudy as I used a new can of Cabbot oil-based poly and opened a new bottle of mineral turps (Diggers) to prepare the mix. Could an experienced finisher offer a possible explanation for this?

    Not a drama, just curious !!!

    Yvan
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  3. 21st April 2017, 09:22 AM #2
    q9
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    First thought is moisture absorption. Does it go away when stirred?
    Semtex fixes all
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  4. 21st April 2017, 01:55 PM #3
    PJM16
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    I'm not overly experienced, but my first thoughts would be how cool did it get overnight? If it's to cold, I've known poly urethane to simply not set/dry properly.
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  5. 21st April 2017, 02:41 PM #4
    yvan
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    Thanks G9. Will check & report. Yvan
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  6. 21st April 2017, 02:49 PM #5
    yvan
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    PJM16, I just had a quick look at the Bureau of Met temperatures for the last 4 nights and the lowest temp was 11.9oC.
    So, the temperature inside my workshop would have been a tad higher, say 13-14o. Which could be cold enough to slow down the drying process?

    Yvan
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  7. 21st April 2017, 02:55 PM #6
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    woodPixel
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    As G9 says - moisture.

    Turps from diggers can be up to 20% water.

    This can be overcome by buying IMS from a painting shop... Such as The Paint Place.

    Also, many thin light coats are better than a thick one.

    How about a few pictures
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  8. 21st April 2017, 07:37 PM #7
    yvan
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    Hell. I would have thought that 20% moisture in the turps would be enough to separate into 2 layers - obviously not!
    Will get IMS and prepare a fresh batch!

    Pictures...you are now throwing a biiig challenge . I'll have to visit the FAQ's and have a good read. Will try to accommodate!!

    Cheers Yvan
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  9. 21st April 2017, 10:33 PM #8
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    Quote Originally Posted by yvan View Post
    ...... I'll have to visit the FAQ's and have a good read. ....
    Uploading photos as attachments
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  10. 22nd April 2017, 11:04 AM #9
    themage21
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    Silly question, isn't IMS metho, not turps? Perhaps there is some solvent confusion going on?

    Cloudy would still indicate moisture and tacky after a 13deg night wouldn't be unexpected, but I would think that 20% w/w water in turps would formm a layer unless emulsified.

    The other options for cloudy poly in the tin is LOTS of entrained air or your pot is near end of shelf life.
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  11. 22nd April 2017, 11:38 AM #10
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    Quote Originally Posted by themage21 View Post
    Silly question, isn't IMS metho, not turps? Perhaps there is some solvent confusion going on?.
    Gak! Of course, how incredibly stupid of me. I wasn't thinking. You are of course right.

    100 apologies.
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  12. 22nd April 2017, 11:50 AM #11
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    Big Shed
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    Quote Originally Posted by woodPixel View Post
    Gak! Of course, how incredibly stupid of me. I wasn't thinking. You are of course right.

    100 apologies.

    This is the main reason I hate the use of acronyms!
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