Yes. It is possible but the process can be expensive as far as the cost of the stain is concerned and the area of the slab.

If you have an existing concrete slab you can certainly remove the existing floor tiles and then Mechanically Polish the concrete slab.

Yes, any concrete floor can be ground and sealed or mechanically polished.

Smooth objects and/or objects that sit on the top of a slab might become dislodged from a polished floor leaving a hole.

We certainly do perform this type of work however your question raises several important other questions and considerations.

On completion of machine polishing the floors we recommend to cover with Ramboard™ Floor Protection until the end of the build.

Yes, this will avoid the concrete supplier from sending truck deliveries from different depots and using different batches of concrete. The concreter can then also take special care to avoid screed marks and aggregate inconsistency.