For painting work I usually protect the floor using big sheets (like 4 x 4 meters) of transparent plastic sold in Asda that I spread around the room.
However it can move a lot while I walk on it and then there are spaces left exposed. Also it's not very flat.
Ideally I'd like something which covers 100% of the floor 100% of the time while being as flat as possible. Is there such a solution?