I used rectangular grinders which slosh and twist and gouge the stage 5 finish. I've used rectangular vacuum sanders, one on a fixed base and the other on a flexible base, and neither sand well. It's mostly sieve marks or, in the case of flexible ones, it's too hard and difficult to sand if you don't hold it at the right angle. As far as I know, this Hyde rotary sander has a 10 point. No hits, no ridges, easy to control and great for feathered edges. With the screen on, there is no trace and the screen lasts a long time. Much of the dust-free, green drywall falls to the floor and floats in the air a bit, which I attribute to the screen being on. I bought some round sandpaper to use with this tool but I'll pay for the more expensive Hyde screens that work so well. If you've never sanded drywall before, you won't realize how good it is. If you used rectangular ones, toss them (or just use them for corner work) and keep these. This will make grinding much easier.
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