First, I cleansed according to the directions in the kit. Then, I prepped my skin with the solution in the kit. After that, I sloshed on the runny 50% glycolic. It felt like a cross between poison ivy & a really bad case of hives. I left it on my forearms & the backs of my hands for a good 2 minutes then removed it. I also did my face & neck but for only 1 minute.
Today, the treated skin is incredibly soft & smooth. There is no extreme peeling nor can I claim any lightening after only one short treatment. It does exfoliate excellently & in a few days I may peel according to some people here who've done this before. I intend to use it weekly on Thursdays for a good 2 months or so. My face continued to sting all evening: felt like a hard slap in the face & my already reddish skin was redder: like I had applied too much blush. I used a touch of Hydrocortisone cream on the reddest areas & it soothed them tremendously. Today, theres's a little pinkness near my jawline & under the orbits of my eyes (upper cheek area). I'm hoping that, over time, it'll help with my lightning regimen. Many people swear by it.
If you have sensitive skin, do NOT buy the 50%. Try 20% & work up from there.