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What type of resin do you use?


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#1 telemarq

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Posted 09 October 2003 - 06:13 PM

I'm interested in what kind of casting resin others use when needed.  I've used Micromark CR 600 but it was too white and it may have sat on their shelves for awhile because it never cures properly (I mix exactly and  store all my resins with x-tend it, so thats not the problem). Pot life was about 4-8 minutes depending on quantity mixed.  I've also used Douglas & Sturgess Insta cast off white.  It cures nicely to a kind of yellowish tone but the pot life is insane, sometimes less than a minute for larger quantities.  D & S also has an Inta Cast Mk IV white that has a pot life of 3-5 minutes and cures to a cream color.  Very easy to work with.  Smooth Cast 300 cures to pure white but also has a very short pot life.  I now seem to have settled on Smooth Cast 321 which has a 3-7 minute pot life and cures to a color just slightly darker than the White Japanese resin that Hobbyfan's suppliers use.  It has a low viscosity making it easy to get detail and "de-air" those trouble spots like noses, fingers, etc.  With the Insta Cast MkIV and the Smooth Cast 321, the draw back is longer cure and demold times, 30min-1hr as opposed to 15-20min for the shorter pot life resins, but with all of us having kits that have been sitting on the shelf for months, what's an hour wait? :lol:

Anyway, just curious to know what others are using.

#2 Guest_Ragnarok043_*

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Posted 09 October 2003 - 07:44 PM

i use D & S insta cast, what i do is store my resin in the fridge. not only does it increase shelf life, but also potlife. if you notice when the resin starts to cure it can get pretty hot, the cold inhibits the curing reaction.

#3 telemarq

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Posted 09 October 2003 - 07:58 PM

D&S said they knew of someone who stores it in the refridgerator.  I might try that.  Its just that the Smooth Cast 321 is so easy to work with that I don't mind the longer demold times.  If only they could give it that fresh resin smell that you get when you open a new kit! :lol:

#4 TFCreate

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Posted 09 October 2003 - 08:19 PM

most resins are in a constant state of hardening, the catylists only speed the process, through heating. The fridge option is probably best. The warmer the resin is, the faster it will harden.

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Posted 09 October 2003 - 08:41 PM

Quote

The warmer the resin is, the faster it will harden.

Conversly, the colder the resin is, after removing it from the 38 degree F fridge, the thicker it is and the harder it is to pour.

I've used the CR600 stuff from Micromark and it does fine as long as the mix is good.  What I really need is a good opaque and clear resin product that mixes at 1:1.  I don't want the headaches of using a scale.

I'll have to try the Smooth Cast 321 you recommend.  Is it made by Smooth-on?  If so, do they sell in small quantity kits?

#6 telemarq

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Posted 09 October 2003 - 08:54 PM

Smooth Cast is a 1:1, yes made by Smooth-on.  It comes in different volumes.  Trial size is a pint.

Specs:
http://www.smoothon..../320 Series.pdf

Order:
http://www.smoothon....lastics.asp#320

#7 Guest_Ragnarok043_*

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Posted 09 October 2003 - 09:17 PM

D&S Insta-Cast also uses 1:1 mixing ratio and its much cheaper too.

#8 PolymarX

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Posted 11 October 2003 - 07:17 PM

I also use Smooth Cast off white, it cures in about 7 min demolds in 30. They also sell one that is solid white and cures in 3-4 min. Tricky to use but it's very strong and doesn't generate many air bubbles.




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