Questions regarding tempering & molding
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Tech Help, Tips, Tricks, & Techniques
I agree with Gap's comments and have a few other comments to add. Two hours to temper is way too long and you are definitely over-tempered. Once your chocolate is within your working temperature it should be more fluid than you are describing.
The solution to your problem may not be the end product (i.e. too thick chocolate). Make sure you are melting out your chocolate to a high enough temp to melt out all the crystals prior to beginning the tempering process. If you don'tdo this you will absolutely be over crystalized at your working temperature. If you are stirring for the entire 2 hours, then you will also be over crystalized. What kind of bowl are you melting your chocolate in? Glass will hold heat much longer than metal or a plastic bowl (for microwave only).
One other suggestion for once your chocolate is tempered and you are trying to maintain it's fluidity/working temperaturebesides the heat gun (although I have a heat gun and like it)is to use a microwave. It will take you a time or two to figure out what works time-wise. On my microwave I will put the bowl in for 5-6 seconds on 50% power. Sometimes it needs a bit less and sometimes a bit more but the microwave is a very effective way control the temperature within a few degrees.
As for adding cocoa butter, I don't recommend this as a solution. You can and will figure out how to correctly temper chocolate so that is has fluidity. I think adding cocoa butter is like adding a bandaid and it doesn't solve the issue.
I don't do large molds and have never had the need to put my smaller molds (individual bonbons) in the fridge. It sounds like at your working temperature that you don't need to put them in the fridge unless you are doing large pieces.
I also think taking a class is a good idea. If you live in a large town/city you could even hire someone for a lesson. Call around either to chocolate shops or bakeries and find someone with some experience.
Good luck and you WILL master tempering!
Andrea