i have been using formestane products since 2006, and i am starting my 5th straight bottle of dermacrine.
i have used formestane together with dermacrine many times, even going back to the original pp dermacrine and formestane lv, even a nice little product called e-form.
BPS says on the label of dermacrine not to apply any other topical to same area as dermacrine, so that takes care of that question...i highly suggest that you apply dermacrine to neck and shoulders, then if possible go over with a hair dryer for a few minutes[not mandatory, i just feel it helps with absorption]. and if you are feeling brave try a pump of dermacrine on the balls.
formeron application sites...an easy way to do it without any waste is to apply directly to forearms and rub in using both forearms. another place to apply is back of knees. you could also apply directly to chest.
i don't know where this 'documentary' you talk about came from, but i have years of experience of running dermacrine and formestane together and results have been nothing short of fantastic!!! this is one of the best stacks i ever ran!!!!!!! like it was said earlier, shake bottle everytime before using...formestane is one of the hardest compounds to get into and keep in solution, so shaking it is a good idea!!!