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Thread: Milky finish
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13th December 2009, 03:34 PM #1Intermediate Member
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Milky finish
Hi just finished putting the third and final coat of Botecoat to my strip canoe
all the other coats went just fine up till the final that has now got this milky look
in patchs what did i do wrong ?
Is the high humitity /lot of rain yesterday got somthing to do with the problem
and will it sand out? any help with this problem?
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13th December 2009, 04:04 PM #2
Yes,
Probably there is some moisture in the epoxy from condensation or direct drops of water or from water left in the brush.
You can sometimes get it to disappear by warming up the epoxy with a hot air gun - BUT YOU HAVE TO BE REALLY CAREFUL
Keep the air gun moving - waving backwards and forwards and touch the surface with your hand from time to time .. if it gets hot for your hand it is getting close to being too hot for the epoxy too.
There is probably little chance of it completely disappearing, but it was a moisture problem.
MIK
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13th December 2009, 06:50 PM #3Intermediate Member
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- Aug 2008
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milky finish
Thanks Mik for that info
N.T. just had a tropical low pass our door step and dump 260mm
in two days and this dope decides this is the time to apply epoxy
well its back to the sanding and waiting for a better day
once again thanks
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13th December 2009, 07:11 PM #4
I did mean you can try the hot air gun (or a blow dryer now). Sometimes it can get a lot of it out. But make sure you don't get it too hot.
It can be a bit risky using hot air guns much on freshly applied epoxy as it makes the epoxy run and can heat the timber up so much that it forces air bubbles out.
MIK
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13th December 2009, 07:46 PM #5Novice
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- Dec 2007
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- tasmania
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Simply wipe with thinners, will remove blush
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14th December 2009, 07:45 AM #6
Howdy,
Good point Al, It would be good to double check to see if it is on the surface before getting excited about sanding off the finish.
Sounds like classic moisture problems though.
Water is the solvent for the amine blush/bloom/wax, so that makes it nice and cheap. Some say that a little bit of cloudy ammonia in the water helps, but the newer version of the WEST system book says that is not necessary.
The nice thing about water is that it is cheap - so you can use enough to wash it off the surface. With thinners there is a tendency to just go over it with one cloth (to save money) which may simply redistribute the bloom/blush/wax over the surface.
Best wishes
Michael
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