Having cold, wet, soggy feet when walking is one of the worst things that can happen. Not only is it miserable, but it can be quite dangerous, especially if it’s cold. If your walking boots are leaking then you really aren’t going to have a good time of it.
Most walking boots will come with a level of waterproofing, but to enhance this, it’s best to use some kind of water repellant. You should, ideally, apply this every few months just to keep it topped up.
However, if your boots are cracked, torn or are just generally wearing away then no amount of proofing is going to keep the water out. It’s at this point you’ll definitely need a new pair.