by painting with layers of body paint you can get the "fresh" or in this case not so fresh scrapped look. a lot of companies have color wheels (mehron, kryolan, ben nye, etc.) one of which should have burns and such. really helpful for this. he trick is to blend the edges and not go too dark so it will look natural.
as for sealing spray, both ben nye and kryolan are really good!
Adelheid (KHR!)- 85% done
Fem!Austrian War Succesion France (Hetalia/Nyotalia)- 10% done
Fem!Izaya (Drrr!)- 90% done
Magent!Teto (Vocaloid)- 95% done