Quote Originally Posted by onimaru55 View Post
I haven't found them a replacement for hand sanding or using flap sanders for coarser work but they are useful in certain circumstances like buffing out your hand sanding scratches etc.. There's nothing intrinsically harmful about them more about how you use them - same as anything driven by a power tool.
The 80 grit doesn't work well at aggressively removing rusted and pitted steel? Is it because the pressure using these disc isn't much at all? I'd hope these could work well for mid grit to polish stages with really serious initial removal with hand sanding?

Chris L