Squirt the hair gel into the Ziploc bag. Make sure not to overfill it – 8 to 10 ounces should be enough. Lay the bag on a flat surface and press out any excess air as you zip it closed to seal it.
Fold the zipper end of the bag over twice and secure one end of the fold with tape. Lay tape along the edge of the fold, sealing about two thirds of the length across. One end of the fold should remain free. Bring the edges of the bag together and secure them with a length of tape to form a tube, leaving one end untaped.
Insert the gel filled tube into the beer cozy, leaving the untaped end hanging out. Fold the untaped portion of the bag down over the edges of the beer cozy. Tape around the outside of the cozy so the edge of the bag is secured to the outside.
Squirt a little water-based lube into the tube (note: don’t use the leftover hair gel for this – it will get sticky and may irritate your Johnson). Insert your dick, and bang away