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Topic: The random RESIN question thread!  (Read 375761 times)
Tags for this thread: resin , mold , catalyst , resin_problems  Add new tag
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Diane B.
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« Reply #1700 on: July 28, 2013 09:28:38 AM »

A hemisphere mold could be made from various materials (some of which might require a release), but a fully spherical "mold" could only be made from something like latex rubber, or several-step rubber processes.

Check out some of these links for hemisphere molds (sometimes called "ball" molds because they can be used to make 2 halves for balls), or they may be called 2-part molds or split molds:  


https://www.google.com/search?q=sphere+mold+resin
https://www.google.com/search?q=ball+mold+resin
https://www.google.com/search?q=latex+rubber+mold+resin+sphere

.
« Last Edit: August 12, 2013 05:43:58 AM by I Sew Cute » THIS ROCKS   Logged

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BarbecutieJunk
« Reply #1701 on: July 28, 2013 12:38:05 PM »

I recently started working with resin, and am loving every bit of it. 

My favorite molds are silicone molds. Target dollar spot usually has cute ones for a dollar.  Right now I think they have pixelated hearts, lightning bolts and dollar signs.  You don't need mold release or anything, and they are easy to pop out.

What I have found to be really helpful:
 wooden craft sticks.  (I got a decent sized bag at wal-mart in the craft section for about 2 bucks.  You can reuse them until they get too gunky, or i usually leave them wet on a paper towel, and its time for a new one)
Plastic cups.
silicone molds.

I also use the envirotex lite resin.  I just to two cap fulls, each time, and they makes out 6 or 7 pendants.

I feel like i'm getting a little jumbled here, i'll stop while i'm ahead.  Message me if you any questions!
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« Reply #1702 on: July 28, 2013 06:04:22 PM »

A full sphere, and either a one or two-piece mold is totally fine (though I think I would *prefer* a single piece).
Eventually looking for multiple sizes from about 1"- 3". Around 2" is where I'd like to start.

Have you thought about making your own mold from a spherical form?
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simplypetal
« Reply #1703 on: July 28, 2013 11:35:42 PM »

A full sphere, and either a one or two-piece mold is totally fine (though I think I would *prefer* a single piece).
Eventually looking for multiple sizes from about 1"- 3". Around 2" is where I'd like to start.

Have you thought about making your own mold from a spherical form?

I have, yes. Smiley I've never made a mold, so I'm just looking for an alternative at the moment. I know it's kind of a tricky thing to get right. I'll look into the two part option some more. Thanks everyone!
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KRSTN
« Reply #1704 on: August 04, 2013 03:08:07 PM »

There are different kinds of resin, and the 2 main kinds are intended either for deep molds or for shallow molds and coatings.  And one "tweaked" epoxy resin (Easy Cast) can be used for both but has some disadvantages after curing.

You can read a lot about the kinds and how they can/should be used, as well as molds you can use or molds you can make to use with resin, plus much more, in my previous YahooAnswers here (which also include a link to the page at my site on resins):
http://ca.answers.yahoo.com/question/index?qid=20091115185640AAXBfZF
http://answers.yahoo.com/question/index?qid=20100402061140AAD0jwB

http://answers.yahoo.com/question/index?qid=20100206091500AA7eXFv
http://answers.yahoo.com/question/index?qid=20100521191232AACynOx



.

Wow! Thanks Smiley you rock

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I Sew Cute
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« Reply #1705 on: August 12, 2013 05:41:26 AM »

Going absolutely bonkers over here trying to find a suitable spherical mold that ships from the US.
I need an actual sphere, no flat sides. Am I just better off attempting to make my own mold, or am I being dense and not looking in the right places?!


No matter if you purchase a mold or make your own, you're going to end up with a flat area where the resin is poured into it. If you get 2 hemispheres, you'll have to fuse them together...or if you get 1 single sphere, there has to be an area where the resin is poured into the piece which will need to be sanded/buffed down to make it smooth. Know what I mean?
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« Reply #1706 on: January 06, 2014 05:54:35 PM »

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
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Diane B.
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« Reply #1707 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
few of my photos
http://s96.photobucket.com/albums/l163/DianeBB
(had to move them from YahooPhotos, so many now without captions)
GoldenSunshine
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« Reply #1708 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 #1709 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)
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