I wouldn't recommend applying TCA at home unless you are a licensed esthetician, RN, or derm and have a full understanding of skin histology and how different acids exfoliate & improve the skin.
Charleygirl2007 is obviously an internet troll and NOT a licensed professional. 45-50% TCA? Really?
And your at home lab concoction sounds like an amazing lawsuit waiting to happen, as well.
Now, advise from a licensed...