You definitely want to wait for warmer weather to apply it as it takes like a week to cure in warmer weather. This summer will be the 2 year mark for my drift boat and I think I will reapply only because I want to keep a good coat on there. We float a lot of low rivers and have pushed over a lot of rocks and it is holding up well.
The best part about wetlander (in my opinion) is when it comes to re-coating it, all you need to do is sand it, clean it and roll it on. As opposed to other materials that require complete removal down to bare metal again.