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Topic: What it is about Doming Resin that makes it dome?  (Read 1504 times)
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Hippie9
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« on: November 17, 2009 08:53:40 PM »

I'd like my resin to dome but I bought Easy Cast long before I decided I wanted the doming type.

Is there something I can do to this resin (the 1:1 ratio type) to make it dome? Maybe let it thicken a bit before pouring it?
« Last Edit: November 17, 2009 08:54:37 PM by Hippie9 » THIS ROCKS   Logged

Kim

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Diane B.
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« Reply #1 on: November 18, 2009 09:31:27 AM »

I'm not sure if it's just the thickness of the "dimensional" mediums that make them dome or not, but if you're talking about clear mediums like Diamond Glaze and Crystal Lacquer, etc., those aren't resins (like Envirotex Lite, Easy Cast, or polyester resins).  They're actually permanent white glues, tweaked a bit.  They will dome even inside a "cell" and won't shrink back like resins will, but they are softer than resins and will need to have a coat of polyurethane/etc on top to keep scratchability down and also cloudiness from absorbing moisure over time.
(There's more info on those mediums on this page, if you're interested:
http://www.glassattic.com/polymer/finishes.htm ...click on Dimensional Finishes)

Epoxy resins will dome though too but they'll only do that (in one pass) if the resin is applied to a flat-surface object while it's elevated (and has no walls/etc to create a "cell").  The way that's often done is to set the flat item on a stack of pennies (as long as the diameter of the pennies is less than the diameter of the item itself), pour the resin on (some people like to do that in a particular motion) until it domes from surface tension (any excess will fall off if you've used too much**), then let it cure. (Make sure the object or photo/etc is perfectly level though or the resin will end up thicker in one area than another--more important for larger surfaces.)
**so put some wax, Vaseline, or masking tape on the back side to resist the resin or some drips will end up there and perhaps have to be sanded off later if they'll matter.
Can't quickly find a good pic of that process but this video from TapPlastics shows the basic method on a much larger surface beginning at this point in their YouTube video:
http://www.youtube.com/watch?v=oXK98Qohjjw#t=3m29s
(the doming is harder to see because the surface being covered is so large... it would be much more visible on a small photo or flat object like something used for jewelry)


Diane B.
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Hippie9
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« Reply #2 on: November 18, 2009 08:01:59 PM »

Yes, it's Easy Cast *resin*, not Diamond Glaze or anything else. Thanks for this video! I wanted to use pendant trays which have walls so maybe the stack of pennies thing won't have the effect I want. Oh well....

I like TAP videos...they always make things look so easy and effortless!
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Kim

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Diane B.
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« Reply #3 on: November 19, 2009 05:55:51 AM »

One thing you can try even in a "cell" is to do the regular fill with resin, then "top off" with another layer of resin after curing (or at least partial curing--don't know if timing would make a difference.  Could work perhaps for some things?

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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