Do any of you use it successfully? If so, at what concentration?

I used it in a bacon grease base bait I made for grey fox… I had 1 cup of grease to 1/2 cup glycerin.. at room temperature it was like a paste/smear bait… at outside temps it was pretty solid… I needed almost 1:1 or 1:3/4 ratio

Propylene glycol has a much lower freezing point than glycerin.

P. Glycol has a freezing point of -76 F. This is based upon the pure material. The freezing point changes as it is blended with another material. You will need to experiment as to what temperature you need it to remain workable.

Glycerin has a freezing point of 23 F.

Pure glycerine freezes at about +63F, but in a ~70% mixture with water it can go as low as -50F. It has an odd freeze point curve based on concentration.

Glycerine concentration freeze point

I’ve been told lure/bait makers use vegetable based glycerine which is different than animal fat based glycerine. I’ll assume the freezing temps differ also.

Bob Jameson, et al, give us your insights, please.