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Old 03-09-2019, 06:42 PM   #1
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Default mysterious Oil paint phenomena

Spooky title eh?

Where will this thread go?

Does it have to do with something space age, modern, maybe chic?


Or does it have to do with a trend of jazz bassists going missing and a top secret underground headquarters in the arctic?


I have some exterior oil primer sitting around from last year. I opened it up and it had seperated a bit....an amber liquid up top and the white on bottom....
mixed it back up...it looks good....
But is it?
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Old 03-09-2019, 07:45 PM   #2
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Should be, sounds like normal separation. I have used primer like that before with no problem.
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Old 03-09-2019, 09:43 PM   #3
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I have a can of oil from Glidden that I have been using to repaint a bench for 15 years.
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Old 03-09-2019, 10:32 PM   #4
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Ever opened 10+year old oil products? Sometimes the solids are really stuck you got to pour off the liquid and use a chisel to loosen things up then throw it in the vortex shaker but once it looks like paint, smells like paint, applies like paint... I say it's good to go
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Old 03-10-2019, 09:10 AM   #5
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Seems like old oil will do one of two things. Separate as in this case, or skin over. In general when it separates, stir it up and itís good to go. When it skins over, remove the skin, stir it up, and itís good to go.

Not to say oil paints canít go bad, but it takes a real long time or the lid not being shut tight for that to happen in my experience.


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Old 03-10-2019, 11:11 AM   #6
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oxygen will kill oil, If you used half a can it can turn on you very quickly.
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Old 03-10-2019, 11:13 AM   #7
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Nothing unusual as stated by others above. I'm a bit of a hoarder of old paint and I have several cans of oil primer I tap into from time to time. Mix and go. Kilz oil will skin up as JMays said, but most other oils separate. The longer the separation, the harder it is to re-mix the components. When in doubt about re-mixing and if it doesn't look right, I forgo using it and just buy new.
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Old 03-10-2019, 01:00 PM   #8
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If it's gone bad it will smell absolutely nothing like paint. Separated stuff should be stirred VERY well. I wouldn't think of using it unless stirred with mixer on a drill for at least 5 mins. Oil products tend to have a long shelf life if stored properly.
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Old 03-10-2019, 03:02 PM   #9
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Quote:
Originally Posted by cocomonkeynuts View Post
oxygen will kill oil, If you used half a can it can turn on you very quickly.


Some oils like McCloskeys spar varnish and some kinds of Sikkens will skin over within a couple days after opening, seemingly no matter what you do. Iíve tried leaving a thin film of thinner on top, and while that might delay the process a little, it wonít stop it.
Nature of the beast I guess.


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Old 03-10-2019, 03:03 PM   #10
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Cool info here.
It's half a can, but it was new last fall...stored around 50F.
Smells fresh enough as far as I can tell.
I will thoroughly mix it as recommended. Just stirring it a a little and it looks good, albeit there are some turds in the mix, unfortunately.
The project I'm using it for is just for a friend so I'll just use it and pray I don't have to repair something later.
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Old 03-10-2019, 07:14 PM   #11
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I wonder if the decrease in VOCs in recent years will effect the shelf life of oil paint? I know in the past I have used some stuff that had been on the shop shelf a long time.
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Old 03-10-2019, 07:44 PM   #12
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Quote:
Originally Posted by Lightningboy65 View Post
I wonder if the decrease in VOCs in recent years will effect the shelf life of oil paint? I know in the past I have used some stuff that had been on the shop shelf a long time.

Yup Past its rated shelf life so I sell them as 'use at your own risk', but I have plenty of old sikkens products that are 10+ years old and perfectly good to use since they were never opened and the seals are good.

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Old 03-10-2019, 07:46 PM   #13
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Quote:
Originally Posted by Jmayspaint View Post
Some oils like McCloskeys spar varnish and some kinds of Sikkens will skin over within a couple days after opening, seemingly no matter what you do. Iíve tried leaving a thin film of thinner on top, and while that might delay the process a little, it wonít stop it.
Nature of the beast I guess.


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Yes. Only way to stop it is to displace the oxygen with inert gas. You can get them from here.http://www.bloxygen.com/


You can also find these type of product sold as 'wine preserver'
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Old 03-10-2019, 07:55 PM   #14
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Any paints that I wont be using for a long time I store with the can upside down. I have some Jack Tar marine spar varnish from 30 years ago that is still good ,(its my personal stash). Anyway air cannot get to your paint with the lid on the bottom. Air is the main enemy with paint storage , and to hot or to cold storage is not good either.
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Old 03-10-2019, 09:49 PM   #15
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Quote:
Originally Posted by DEK Painting inc. View Post
Any paints that I wont be using for a long time I store with the can upside down. I have some Jack Tar marine spar varnish from 30 years ago that is still good ,(its my personal stash). Anyway air cannot get to your paint with the lid on the bottom. Air is the main enemy with paint storage , and to hot or to cold storage is not good either.
That doesn't work with Sikkens Cetol Dek and some other paints unless can is near full. The air in the can is enough to cause skin-over. That has been my experience, anyway. If you invert can you have a bigger mess yet because the skin breaks up when you put the can rightside up to open. I rather deal with pulling off an intact skin than skimming it out of the product. Although the inversion trick does seem to work well with some paints.

Just like pudding, paint is fine once you pull the skin off the top.
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Old 03-11-2019, 09:24 AM   #16
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alkyd paints will not "spoil" like water based paints will. Really the only way they will go bad is when the solvents evaporate out and the resins harden. This can be a completely hard can or a skim. Just take off any "skimmed" paint and mix it up. If you can mix the solids back into the solvent you should be fine. You may have to add a bit of thinner to get it back to a brush-able state. I would highly recommend straining it before you use it though.
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Old 03-11-2019, 11:13 AM   #17
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I was definately looking for that response @PACman
Straining and getting the consistency right are everyday things, but whether or not certain ingredients spoil has been the primary concern of mine. Thanks!
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Old 03-11-2019, 12:09 PM   #18
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Quote:
Originally Posted by Center_line_Painting View Post
I was definately looking for that response @PACman
Straining and getting the consistency right are everyday things, but whether or not certain ingredients spoil has been the primary concern of mine. Thanks!
Force of habit i guess. You wouldn't believe how many "professional" painters i have had that i have had to tell these things too. No one strains paint at all any more for some reason.
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Old 03-11-2019, 04:03 PM   #19
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Maybe they don't strain anymore because they like smegma in their paint?
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Old 03-11-2019, 05:02 PM   #20
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It took me a while to learn that straining paint going into the HVLP is definitely a big time saver in the long run!
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