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Topic: Premo clay sealants  (Read 766 times)
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NightOwl21
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after all this time I finally show my true form


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« on: October 23, 2017 09:41:25 PM »

So I've exhausted my brain cells trying to figure this out.  I sometimes need to seal my premo polymer clay when I paint them with acrylic paints.  As of late I had a few projects go awry and become tacky with the sealant I am currently using and would like to change it to something where the results won't be half tacky and the other half sealed.  I was told resin as a sealant works but so far not super impressed with the results. 

I am in need of something that isn't going to yellow, that isn't going to take days to dry/cure and can preferably be used indoors and can deal with daily things as the items I make are not considered low use items.  I live in Oregon and so far everything I've looked into needs everything to have perfect no rainy conditions and that is not going to happen any time soon.  Any ideas? Does a sealant like that even exist?
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Diane B.
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« Reply #1 on: October 26, 2017 02:42:24 PM »

First, acrylic paints don't need to be *sealed* if they're used alone since they're permanent paints.  
If they're exposed to a load of moisture over a longish time, especially from soaking, they can begin to loosen, but then so can most clear finishes/sealers since they're also those kinds of plastics.  

If acrylic paint will be exposed to a lot of abrasion however, it could be good to coat with a clear finish that's especially tough like polyurethane, especially the Varathane brand, or with cyanoacrylate floor finishes like Mop 'N Glo, Future, Pledge with Future Shine, etc, or perhaps even with epoxy resin.

No matter which brand/line of polymer clay is used, certain types of paints and clear finishes shouldn't be used directly on top of cured (bare) clay though since they contain petroleum-based solvents rather than water-based or alcohol-based ones and can immediately or later begin eating into polymer clay making it sticky or worse.  Those are ones that *must* be thinned and/or cleaned up while wet with paint thinner, etc, rather than water or alcohol.  That "bad stuff" can also be present only in the propellant of paint or clear finish sprays, though some brands will work okay.  

If stickiness/etc has already happened, some clear finishes can be fixed by "reheating" them (usually at around 225-250 F for 10 min or so), which can also be done for Varathane and/or cyanoacrylate finishes anytime just to make those even harder/tougher than they'd usually be.

Resins will take at least 24-48 hrs to fully cure, and even longer if there's too much ambient humidity or the temp isn't within the best range.  
Some will also yellow from exposure to too much UV light over time or very warm/hot conditions unless coated with a polyurethane containing "UV protection."

Btw though, most all regular (water-based) clear sealers will take a short time to become dry to the touch but longer if they're in humid, cool, or non-well-ventilated areas.  And they won't also "cure" for at least a week under optimal drying conditions.  Even then, it's possible for them to stick to each other or other things if kept in an area where there isn't much ventilation and probably too much humidity (including in drawers, bags, etc).  

You can read more about all those things on various pages at my polymer clay site which will also be linked to from these answers of mine at YahooAnswers with some summaries:
http://answers.yahoo.com/question/index?qid=20120323230957AADW6kU
http://answers.yahoo.com/question/index?qid=20111120211726AADVMeW
http://answers.yahoo.com/question/index?qid=20100606134234AAlJaN0

And you might also be interested in this page, perhaps the sections dealing with "outdoor clay uses," or other uses in humid conditions or submersion:
http://glassattic.com/polymer/outdoor_snowglobes_fountains.htm
...and maybe:
https://answers.yahoo.com/question/index?qid=20100206154939AAb5lxe




« Last Edit: October 26, 2017 02:50:10 PM by Diane B. » THIS ROCKS   Logged

POLYMER CLAY "ENCYCLOPEDIA" 
http://glassattic.com/polymer/contents.htm
few of my photos
http://s96.photobucket.com/albums/l163/DianeBB
(had to move them from YahooPhotos, so many now without captions)
NightOwl21
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« Reply #2 on: October 29, 2017 08:08:37 PM »

First, acrylic paints don't need to be *sealed* if they're used alone since they're permanent paints. 
If they're exposed to a load of moisture over a longish time, especially from soaking, they can begin to loosen, but then so can most clear finishes/sealers since they're also those kinds of plastics.......... 




Thank you so much! I am saving all this info everywhere I can
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