I bought a 30% Glycolic Acid solution from EBay (was a bit worried as t was from EBay but turned out OK) at the end of last year and used it once, before I went to America for a holiday and it kinda ever so slightly helped with fine lines but not overly.
When I got back from America I decided to start using it once a week like it suggested. I had planned another holiday to America to see my friend in 2 months so I wanted to see what effect it would have before I went back.
The instructions that came with it told me to apply it with my fingers, leave for a certain time (from like 6 minutes in the first week, to around 16 mins at the end of the 6 week period) and then use Baking Soda to neutralise the acid, then rinse off. I used it just about every week, but sometimes I wouldn't have time and would have to leave it until a bit later in the week.
Two weeks before America I decided I wanted to see what leavng it on for 30 minutes would do (I know, it sounds totally stupid - don't know why I did it!). I did it on a Saturday night before I went to bed so that I didn't really have to see anyone until the Monday if it went wrong! Well... my face hurt like hell rinsing it off, and was really red and sensitive for about a week - and I started to worry that I was gonna go on holiday like that! But it subsided and my skin looked quite a bit better.
I think the peels have helped to reduce fine lines a bit and the scars I have from the initial outbreak from B5, but it's also lightened my (already quite light) skin... so I need a bit of colour in my skin now! Whether it helped with red marks... I'm not sure. Possibly, but I don't know. The red marks are the things that are getting to me the most now though at the moment!
I would reccomend that you try it - I picked my Glycolic Acid up from EBay for about $18 I think. Quite expensive, but if it end's up giving you great skin (maybe) it's worth it, right? I would like to try Lactic Acid because I've heard it is a really good peel but not as irritating. Just gotta find some now in the UK!
Hope this has helped! Let me know if you have any questions!
P.S. I reccomend you don't look in a mirror while you do the peel - I did and my self-esteem just went! Your skin is mega red, and ANY pimples that you have or may have appearing are just highlighted as huge red dots! I also noticed that pimples would appear while I was doing it that weren't there before! (but they would tend to dssapear soon after)
Oh yeah... guys... don't shave soon before or after the peel... I'll just say... "Ouch!"