Can you describe your taping scheme? Don't use mine if you've been given something different, it'll alter your patella tracking for the worse. If i can see what you're using i can advise you on how to make it work better if i've used it myself.
This stuff is a dressing retention spray, it's like spray on glue...
One of the key points is that your skin has to be grease free before any tape goes near it. You can use surgical spirit or Isopropyl Alcohol (IPA) wipes if you have very greasy skin. IPA is a circuit board cleaner used in factories, i use it at work if i need to clean a cut and stick a plaster on. Likewise wash your hands before handling the tapes; neither will stick to your skin or eachother too well if the adhesive is contaminated. Remember aswell that the luekotape can be pulled up off the fixomull and retensioned a few times as long as you don't contaminate the adhesive or the top of the fixomull.
I've got Comfrey Oil all over my knees at the moment but i can post some pics next time i do some taping.