Whether it needs sealing, how often, and which finishes seal differently from which.
23 questions in this harvest fall under this subject. 3 answered so far.
Yes, a cement-bound floor does, and the timing is measured in hours not weeks: the trade guidance is a penetrating sealer applied about 12 hours after installation, with two coats as standard. A resin-bound epoxy floor is a different case — it is non-porous, so it needs a sealer for stain resistance and UV protection rather than for permeability.
A cement-bound terrazzo floor does, because a cement matrix absorbs by definition — the Chinese classes run from 8.0 per cent downward, and the higher the absorption the more often the sealer is refreshed. A resin-bound terrazzo does not need one in the same way: it absorbs very little, which is why it is the usual choice on walls.
Because cement and pigment are the colour. A terrazzo panel takes its colour from the binder and the pigment, and the code requires one colour layer to use one factory's pigment in one batch — which is why two panels ordered months apart from the same colour name are not the same colour, and why a repair in a different batch shows.
These are the phrasings people typed, not headings we invented. Where one has an answer the link is live; where it does not it is printed plain, and that is deliberate — a printed question with nothing behind it is an honest promise, and hiding it is not.
Read the answer first — it says which of these to specify and why.
Ordered by how many questions each one holds.