well buddy,i am in need of tech help too,so i know how it feels !
that is a 1 pc crank,it may not be worth spraying the frame because it is either low quality or oldschool.
however i have removed that bolt back when had a 2000 gt,id get one of these :http://en.wikipedia.org/wiki/Wrench,then spray wd40 and see if that loosens it ,it is vital to have the right size wrench and apply quite a lot of pressure to make the nut budge :)