The carbide grinder leaves a pretty rough and uneven surface. And yes it exposes the aggregate. Be aware that this process causes a LOT of fine dust. Do use the water connection on the grinder if available and a shop-vac. It is a loud, and tough task...
Yes it is possible to stain it like that...
I am doing some insulation work that would expose the framing in my house and I was wondering if there is any wood treatment I should apply to the framing before I enclose the wall again. NB: Work will be done from the inside.
Was thinking of some water-based and possible sprayable product...