Minimal grinding?

[Hank11]

I think I could give my floor a quick sanding/grinding at about 200 grit to get an even “color”. “Color“ in this instance means a fairly uniform surface all over in prep for finishing with a clear sealer. Is there any reason not to do this? Can it be done? What machine?

 

[The Cobbler]

is this concrete ? 200 grit will hardly touch it in my opinion.

 

[WisJim]

Sanding or grinding, to me, are quite different. I just used 80 grit sandpaper on an old varnished oak floor as prep for new finish, and can't imagine it doing much to concrete.

 

[KYCountryboy]

200 grit sanding on a coating may be just fine for applying a refresher coat -provided it's well bonded. 200 grit on bare concrete will not do the job, you need much much more aggresive abrasion.