I have used an air compressor for at least 20 years. I always use a piece of PVC to prevent grip expansion when removing any grip. I have a couple of pieces of PVC customized for oversize grips. If the grip is reluctant to release I stop, shoot a bit of solvent into the shaft, and then use air in short burst to work the solvent down the grip.
I used a standard air gun with the long nozzle as was mentioned earlier, similar to what harborfreight sells. However, I cut off the butt end of a grip which is no longer usable, to make it like a "washer" and slide it on the shaft of the air gun nozzle. This with a small rag or paper towel will prevent any blow back of solvent when you use air with solvent in the shaft. Just hold it firm and the rubber to rubber contact of the grip and homemade "washer" helps seal the air pressure and solvent to move between the grip and the shaft. This works as well as any of the commercial units I have used sold for grip removal.
Finally, I blow grips on all the time. But, if I am using a grip I blew off another club or have any concern about slippage, I will cut 2 pieces of standard two sided grip tape, about an 1-2 inch piece cut across the the width of a 2" roll of grip tape. I will place these around the grip, one under the upper hand and the other below the end of the grip of the right hand (for a right hand club) which insures you will never have a grip slide and you don't have to add additional masking tape building up the width of the grip. You will need to use a bit of solvent to activate to glue, some of which will actually get shoved down the shaft when you put on the grip, and a bit of solvent when you go to later remove grips applied in this manner. However, you will not be dealing with a boat load of glue, but enough to be effective adhesion and light enough to allow for easy removal, with a small amount of solvent and air pressure.
