Which type of 6" H&L discs for my rusty frame?

[Larry Jenkins]

Just flipped the frame over. The underside is a little rusty and a little rough.

I am looking for a flexible; hook and loop 6" sanding pad for my 6" Porter Cable sander to remove the bad stuff.

Now.. Who makes a good brand of 5" discs made for sanding metal?

Is Silicon Carbide the type of sanding media I should use? 60 or 80 grit?

Would appreciate any advice and/or recommendations to make my frame look purdy..

My elbows are all greased up..

Larry