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Post by Rick B on Feb 20, 2019 15:17:55 GMT -5
Hi. I just wanted to make sure that I'm fully understanding the Open Time, Demold Time and Full Cure Schedule as stated on the Technical Data Sheet of the Clear Slow casting resin.
Am I correct in assuming the following:
An Open Time of 12 minutes at 75 Degrees means that this is the allotted amount of time before the mixture hardens/becomes unworkable in liquid form.
A Demold Time of 2-4 Hours at 75 Degrees means that the resin in fully hardened. At this time, am I able to begin my cutting/shaping/forming of the mold into the design that I desire or do I have to wait the 5-7 days at room temperature as the Full Cure Schedule indicates?
Finally, when during the process (I would assume before the 12 minute Open Time is up) and for how long would you suggest that I put my resin under pressure to get rid of any bubbles that may have formed? Also, is there a certain PSI range that works best to eliminate the bubbles?
I thank you in advance for your guidance.
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Post by notoes on Feb 21, 2019 8:25:10 GMT -5
Yes you have the Open Time right.
Yes it normally is hardened enough to demold at that time but sometimes the working environment is a little warmer (it'll cure faster) or a little cooler (it'll cure slower). Full cure can be sped up by keeping it a little warmer (but don't use too much heat). You can do the cutting/shaping/forming as soon as it hits the Demold Time but if you feel any stickiness, you will need to leave it alone or apply a bit of heat (I use a hair dryer).
As for using a pressure pot, I don't use one so someone else will need to speak on that.
I hope this helps some.
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Post by Resin Junky on Mar 24, 2019 13:21:49 GMT -5
I use a pressure pot for my resin molds and they do work very well. Pour your resin into your mold and get it into the pressure pot as quickly as you can. 45 to 50 PSI is excellent (do NOT exceed the pressure threshold of your pressure pot) and let it stay at that pressure for the full curing time of your specific resin. I have also just tried something new. I heat the resin in 90 degree (Fahrenheit) water (just set your cup down into a bowl of water) for a few minutes and then pour. The heat gets it very runny and the bubbles come out easier. My casts come out sooooo clear and free of bubbles!!! However, if you are using a fast setting resin you will have to move even faster if you warm the resin. Heat will make your resin cure a lot faster, so be forewarned and experiment before you try this on something important. I find that by warming my resin (before or after its mixed) I don't even need to use my pressure pot anymore. Good luck and remember that temperature! Don't use boiling water or anywhere even close to that temp or your resin will harden before you can get it poured (trust me on this one, LOL). Once your resin is runny like water, take it out of the bowl and pour it! You will be pleasantly surprised I think.
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Post by Resin Junky on Mar 24, 2019 13:22:44 GMT -5
Also, dont put air into your pressure pot too quickly or you will make resin splash everywhere inside the pot!
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