I posted this in the homebrew section a few minutes ago and thought more people would see it in here. This is something I tried awhile back and it worked really well.
I had bought some cough drops that came in little plastic blisters with foil backing. I cut those apart, being sure to save as much flat area around the bottome of each one as possible. Go to the pharmacy and purchase some skin adhesive. There are several different types, but I got the kind that patients use around colostomy seals. It only takes a small drop to seal so don't go overboard unless you want everything around glued together.
Then mix up your penetration enhancer of your choice, put in the blister, get in an akward position so you don't spill it, and stick it on with firm pressure around the edges. I used isopropyl and dmso and got a real good little irritated spot, but it is a small area and goes away quickly.
Reapply every twelve hours. It's also good to keep the smell down from T-gel or dmso. Enjoy.