Spark should have voltage too it the bigger the paint brush the bigger voltage. A big enough voltage if you spark metal with it the metal will get too 500c. If you have any wood 20 pixels near the spark on the metal the wood will catch on fire because it would jump too the wood in a weird type of solid called jusp. It will catch the wood on fire then disapear idea exspandable.
@UBERNESS I probaly saw it once but my bad memory made me forget sometimes i am holding a item then i forget i am holding it then go around the house and look for it then i find out its in my hand my memory is super extremely bad :(