Rich Rosenblatt 
Initial IQ Lustre Paste
One thing that always drove me crazy before CEREC was adjusting contacts and opening one up. Don't tell me that I'm the only one who has ever done that! Since I became a CEREC user eight years ago and we got our oven, I have been able to deal with that with relative ease.
One product that has really made that even easier for me is Initial IQ Lustre Paste NF from GC America. The reason that I really like this product is that it is porcelain infused. I find that you can thicken it up a bit and add that to a light or slightly open contact and get that floss snapping once again! I do not add back large open contacts but if it is light or just barely open, this stuff works like a charm!
The other thing that is great about this product is that it is a low-fusing porcelain so it can be used with any of the porcelain blocks. I use it with both my Empress and VITA blocks and the stuff looks great. If you are looking for a glaze that will work with either porcelain block, and also does a great job of adding back a contact you may have ground away, give it a try!
