For our terracotta tiles, we had planned to use an impregnator and then to wax them. But I've read several suggestions to use linseed oil, raw or boiled, then wax.
The impregnator we have already used is Hagesan Impregnating Sealer:
I presume that linseed oil is a completely irreversible treatment.
Any advice or suggestions would be very welcome.
Daniele