I use Kiwi brand Dubbin (might be an Oz/NZ product) and just warm it up and rub it on. I normally do it every couple of months and work it in to the stitching.
It is not completely waterproof in our Queensland downpours (if we ever get rain again) but will hold out the water in "normal" rain for about an hour or so. I find it really good and it conditions the leather too.
Then you just have to worry about it dribbling in to your boots!!
The reapplying of the Dubbin can be quite therapeutic. Must be a hunter/gather thing!! :wink:
In the olden days sonny we used to rub in lamb's fat. I think that I am glad that I moved on from that stage..