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Topic: The random RESIN question thread!  (Read 278541 times)
Tags for this thread: resin , mold , catalyst , resin_problems  Add new tag
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Diane B.
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« Reply #1710 on: January 07, 2014 09:22:50 AM »

Yellowness in epoxy resin can be caused by too much UV light (sunglight, fluorescent light) or heat (room temperature or other heat) over time, or by creating epoxy resin items deeper/thicker than 1/2" or even less (unless that depth/thickness is created 1/8" at a time).
 
So either keep your items away from those situations or don't make thick items with one pour.
Or you can coat them once hardened with one of the  (clear, gloss) polyurethanes that have UV protection.  Varathane is one brand of polyurethane that has UV protection (the water-based one at least), but that should be written on the front of the can at the hardware store.
Using a coat of polyurethane will give an even tougher surface on resin items as well.

Actually, re-reading your post I see you said you purchased a medium-sized *bottle* of Envirotex Light.  Assuming that was just a typo since epoxy resins (and polyester resins too) come only in two parts--two bottles, part A and part B.  They won't harden till mixed together.

It also sounds like perhaps the yellowing was in *one of the bottles* however (the one with the "hardener" I guess you meant, or part B).  If that's the case, it could also be excess UV light or heat (or age).  If you haven't kept your bottles away from heat and light during the month you've owned them, you could probably just take them back to the store for a refund and assume that the resin was already "too old" on the shelves (resins do have a shelf life--about one year).

You might also want to check the resin page at my site for more info and tips:
http://glassattic.com/polymer/other_materials.htm

 
« Last Edit: January 07, 2014 09:36:23 AM by Diane B. » THIS ROCKS   Logged

POLYMER CLAY "ENCYCLOPEDIA" 
http://glassattic.com/polymer/contents.htm
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GoldenSunshine
« Reply #1711 on: January 07, 2014 10:32:28 AM »

What I meant by medium size bottle, there are three different sizes, I brought the middle size. I do also mean the harder, as Part B. The thing is, I brought it and it was still in the box, in my closet, no heat exposed, unless it was from the heat from the floor (I live on the second floor of a apartment complex). I went ahead and mixed them and they appear not too yellow, so I am okay, but I am going to have to purchase another bottle that is in better shape so I can use it for resin that has to be clear color. I am using the yellowish resin to mix glitter, etc.
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Diane B.
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« Reply #1712 on: January 08, 2014 01:10:37 PM »

First, it's best to refer to part B of a two part resin as the "hardener" (or the "catalyst" especially if referring to polyester resins).  Just "harder" is easy to misinterpret.

As for the bottle sizes, I'm not aware that Envirotex Lite epoxy resin comes in more than the smallest size/quantity at regular stores..at least they didn't used to be:
http://www.jerrysartarama.com/images/products/acrylics/envirotex_lite/0050338000000-st-01-envirotex.jpg
http://www.highlandwoodworking.com/envirotexlite8ozkit.aspx
Here are the quart and gallon sizes though from online:
http://www.highlandwoodworking.com/envirotexlite16ozkit.aspx
http://www.highlandwoodworking.com/envirotexlitegallonkit.aspx
Polyester resins may come in more than one size even at craft and hardware stores, but usually in only the smallest size.

Do note that part B may normally look a little yellowish in the bottle because it's thick, and especially if it's a bit older. 
http://www.amaco.com/cpwp/wp-content/uploads/2012/03/fracture-fusion-p17-apply-envirotex.jpg
You probably wouldn't see that once you've use in more thinly though.
BUT keep in mind that most of the yellowing in resins comes AFTER they're hardened, and have been exposed to UV light a few months or to too much heat.

As I said though it's quite possible that the resin may have been too old for good performance too.  Shelf life is only 6-12 months, but according to others it's a lot longer if kept in good conditions. 

.
« Last Edit: January 08, 2014 01:17:14 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)
I Sew Cute
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« Reply #1713 on: January 25, 2014 01:22:42 AM »

Sigh- I purchased a medium size bottle of EnviroTex Lite resin, a month ago (I did checked, the harder was clear according to my eyes), fast forward a month, now it is a little bit yellow. If I go ahead and mix a batch, will it come out yellow or clear? Help!  Huh
If your resin has yellowed in the bottle, then consider it expired. I wouldn't work with it.
« Last Edit: January 25, 2014 01:27:28 AM by I Sew Cute » THIS ROCKS   Logged

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