First off there is GLYCERIN and PROPYLENE GLYCOL. Propylene glycol may be your best choice here as its easier to "cut" with water. I would cut with 1/4 water to 3/4 P.Glycol to be safe ...you could always add more water. In super cold conditions use less water in early season frost conditions use more water. May take you a season to figure out what works best for your conditions.
For my techniques I dig my trap bed squeeze my trap in, bed it solid, sift a layer of top covering a spray a mist over this covering then sift another layer spray another mist over and repeat. Blend your final cover and mist entire pattern. Hope this gets you started.