The rezblock has VG, citric acid, water, and essentials. So, from what I know about VG and PG they dilute oils, such as THC, or concentrates. That is why people use them to make vape tinctures. I am going to purchase some vegetable glycerin and make what heavydog mentioned basically: VG, water, lemon juice. Just to keep the resin mixed with the VG, and not on the glass!
Edit: I'm frugal, so it will basically be a trial and error approach starting with a low amount of VG and increasing as needed. I'll let ya know.