First and foremost remember each of these is a formula with multiple components to achieve not just softness or hardness, but also heat stability, micro bubble resistance, plastic texture, hard pack / suspension, etc, etc. Each formula is different and if you are making drastic changes you may get some surprises along the way (not bad, just maybe something you didn't anticipate).
With that said, please experiment. Not being a chemist I have had to learn a lot by trial and error. There's nothing wrong with this, and I think it will make you better off in the long run.
As a general rule I have gotten better results blending formulas if I'm really want to make a change. Why? Because the ratios of resign, stabilizer, plasticizers, etc. are already tested and established.
If you are making modest changes (<10%) you should rarely see anything strange going harder or softer. If you are softening by more than 10% you may see some micro bubbles (it really depends on what you are softening with and how you are heating - lots of options and variables).
We don't sell the hardener, but that's just a matter of me getting it on the site. With it, I have added as much as 20% without any surprises. The key thing here is to recognize you are adding additional resign (as a percentage), which may require additional stabilizer - again, depends on the heat being applied.
As far as mixing CCC with other products. Some work really well, others just okay. It is just a trial and error learning experience. I wouldn't discourage it, I would just work in small batches. This is really true across the board with any experimenting.
Jason
