To avoid the part cement mix find out if you need chaux hydraulique or chaux aérienne and then look carefully at the bags. In fact if you go to a place like Bricomarché or Mr Bricolage all they have often is the mix, so go to a builder's merchant like Chausson or Point P where they will have all kinds. Making own lime paints is very easy and costs a fraction of the price of bought stuff. We have done a whole room including the floor for which I spent an extra €5 to buy a bottle each of linseed oil and turpentine for less than €20 and we have lots of pigment for making more paint, plenty of chalk anyway plus the oil and turps for wood, enough to do an entire house for under €50. Bought lime paint does not do that and also won't do your floors.