Ive been using minoxidil on the temples for just over a year now, with a gap of 4 months last summer and i can say ive grown 20-30 new hairs either side. Ive concentrated so much that i forgot about the crown so now im gonna be doing both. I use the liquid version which is much better than the foam (if you can control the flow) because it stays on the skin for longer.
Best method is to apply at the crown, let it run towards the receeding areas and then catch it and rub in.
Its fair to assume if ive got results from the front (which minoxidil isnt designed for) i should be fine on the crown yeh?