I'm having issues getting the peel to peel my face. A friend that helped applied the same thing I applied to her face isn't peeling mine when it peeled her skin. Is there some sort of prep I could use before I try this peel again so that it evenly gets my entire face and peels evenly? Using a 20% Tca peel bought from Roseville, CA on eBay. That store seemed pretty legit. I just wish they knew why the peel wouldn't penetrate my skin.