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Topic: Sticky Resin Help  (Read 6844 times)
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« on: April 27, 2009 02:42:56 PM »

I am making resin pendants with molds using castin craft resin and catalyst.  I don't know what is wrong because on each batch I made, the backs are a little sticky.  On the first batch I did 5 catalyst drops per ounce of resin, and I am doing layers.  On the second batch I did 10 drops of catalyst just to make sure it would not be sticky, but it is still sticky!  But what is weird is, that the front part that was in the mold is not sticky at all. Just the back is a little sticky... 

The only thing I can think of is that I mixed colors in for the back layer...and maybe that is effecting it?  I used some castin craft resin dye....maybe its the wrong kind?

Either that or it is really humid and rainy right now in texas and that is messing it up. 

Diane B.
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GlassAttic --polymer clay "encyclopedia"

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« Reply #1 on: April 28, 2009 10:58:19 AM »

First, polyester resins don't actually cure thoroughly in the presence of air (that's why the parts in contact with the mold cured thoroughly and the back didn't).  This can be made worse in some situations, and humidity might be one of them so just waiting a few more days could improve things. (Epoxy resins do cure next to air.)

There are other things you can do after curing though, and I think some before curing, to fix that.  Generally, it isn't a problem because the back side of a cast item may be covered with something else, or just won't show. 
Check out this page at my site for various ways to deal with the stickiness of polyester resins:
...click on Polyester resins then scroll down a ways

(P.S.  The Castin' Craft brand mostly makes polyester resin, but they now also have an epoxy resin--Easy Cast-- but that's quite different and does have some problems. 
You might also want to check out the permanent resin thread on this board for lots more info on resins too... though it's humongously long!:
https://www.craftster.org/forum/index.php?topic=10667.0 (this is starting with the first entry, awhile back)


Diane B.
« Last Edit: April 28, 2009 11:01:36 AM by Diane B. » THIS ROCKS   Logged

few of my photos
(had to move them from YahooPhotos, so many now without captions)
« Reply #2 on: April 30, 2009 08:11:00 PM »

Thank you Diane!  You're website is very helpful!  I tried the nailpolish technique...hopefully that will seal it and make it cure... Smiley

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