MyMix Pressing Medium is a blend of silicones with a mid-weight viscosity.
Is it recommended to add a preservative when using this? or is there one included in the mixture?
There is no preservative in it. It would be recommended to add about 3 drops per fluid ounce.
Can I use this to press eye glitters?
You "can" but I don't think it will accomplish what you want. We have been working on coming up with a good base for making a pressed glitter, and one of the criteria is that the base be sticky (a lot of DIY pressed glitters are made with glycerine, which is sticky). This pressing medium is not sticky enough for glitter.
As of 3/2017 we don't have a good option for you, but we are working on it in our labs and hope to have something soonish.
I bought an eyeshadow kit recently and it came with this do I add preservation cap 5 in it?
Yes, that would be correct. We also have a Cap 2 preservative which you may prefer.
Can you use it with glitters? If not do you have a product you can use to press glitter?
We are working on a good glitter press base, but this could be used. It is not the "ideal blend" however.
How is this product used? Do you add it to the powder before pressing it into the pan?
Yes, that is correct. We have a video here:
What is the expiration date on this? Does it have one?
The shelf life is 24 months. As a general rule, our product is somewhere in its 1 - 3 month shelf life because it is manufactured on demand.