Hi Jess,

So sorry I’ve taken such a long time to reply. I’ve had a few computer problems, but I’m back up and running now.

The usual gap between narrowboat blacking is three to four years. You can get an idea how your hull is holding up generally by looking at the condition of the steel on the waterline. That’s usually where you will find rust first. If the waterline looks OK, there’s a pretty good chance the rest of the hull will be OK too.