“Traditionally the only way to fix severe burn wounds is a skin graft. Skin grafts are highly painful and generally leave huge scars. With this new process scientists include some stem cells in the mix which allows hair follicles and sebaceous glands develop in the new layers of skin”
So basically you’d have to light your head on fire, and then get treated for 3rd degree burns with this spray-on Skin treatment and three weeks later start regrowing a full head of hair. Piece of cake!