If you really want to spend some time wasing time, figure out how many square feet of skin is on the average person, ( i believe its around 13) then figure out how many square feet of skin in on a fuller sized peron. Im quessing just around 16- 17. Then figure oz of
solution divided into the square footage of said client. Next, breakdown cost of
solution per oz., then you could figure the cost of our fuller sized client versus our leaner sized clients.
Seriously, if you feel the need to raise you costs thats fine, but dont affend your clients in the hopes of making a quick buck, i promise clients are very $$ wise as are the rest of us. As i've said before" be generious to your clients and they will do the same for you" .