Sculpt Geometry Tool Help

Does anyone know how to use this tool without it destroying the mesh of my caracters. Here is what i am trying to do:
I have made hte first half of my caracter and made a duplicate special to have the other half. Whwn a connect them I always see the seem in the middle.+ Since I do it from a box modeling my caracters always end up alittle squarish.I tried to use tha tool and it seems to have a mind of it own sometimes it works sometimes it dosen't do anything. Is it because my caracters are made of just polygones.

Well it only works on the polyhons. So if you want to sculpt you usully need a lot more points than youd normally have. Then you kindof need to level the history of the mirror first.

thanks, now i get it!