Morso squirrel stove chimney

[Timx]

Getting stove ready for winter, all swept, and baffle put back in without rebreaking the cemented bricks from last year. I moved the Eco fan, which has been in front of stove chimney since March, I notice directly behind it, the stove chimney has rusted. This has only happened since the fire was shut down. The stove and chimney is as old as boat and never had this before (10 years) 

cant see we have done anything different to cause this'sudden rusting.

Anyway, what is best solution? Rub it down, apply fertan rust remover and paint with stove paint is my thinking , but is this the right way to go about it ?wi have caused a repeat, can someone please delete one thread, ta

Edited September 9, 2019 by Timx