I want to paint the rusted spots on my swing arm... I was going to strip the paint off of the swing arm completely and respray it but I think if I stand it down to make it level and smooth I can spray it without taking all the paint off... What sand paper do I use and what grit? 

Nope, its powder coat. Chances are its laid on a base coat and that bstd reacts. Least it has done with the 2 bikes i have stripped and re done. 

You ideally need to baremetal the sw arm and work up. Will give a finish worth the effort though. 

There is only one problem... They have welded the swing arm but in so there is no way to take off my swing arm 

Nope, its bolted in the same as any other swing arm with a spindle.

 

As above really, you have to be able to unbolt it if for nothing else than to grease the bearings. Usually every 6 to10 thousand miles.

Diagram of generic bearing showing the various bolts and shafts that need to come off. This one starts at number7. NOT your bike but similar I bet.