Cat urine damage to floor boards

My beloved senior cat has taken to urinating wherever he wishes. I
doubt that we can change his behavior, so my strategy is to minimize
the damage. My immediate question: how do I prevent damage to wood
floorboards? I have been wondering if I could coat them with a water
sealant, such as Thompson's . . . or would applying water sealant to
floorboards damage them? Many thanks for any ideas . . . .