You need to apply a rust retardant primer to protect the roof from developing rust.
Can you paint a rusted tin roof.
Unfortunately over time this coating can fail leading to minor rust outbreaks.
You can apply something like ospho affil.
You cannot set up roof jacks on a metal roof as you can on a shingled one so if you plan to paint with a brush or roller include a safe way to reach the ridge in your plans.
Step 2 prepare the metal.
One issue that tin roofs have especially older ones is that they can get worn out and rusty rather quickly.
I have used both regular paint and roof coat on old metal roofing with pretty good results.
If you are preparing to paint a rusted galvanized metal roof pay special attention to surface preparation or you will have a recurrence of rust and or flaking.
If properly painted the paint will not only improve the appearance but protect the roof from further rusting.
The roofs i have done have lasted a minimum of 20 years now.
Before you replace your roof talk with us as we have alot of experience in rusty roof coatings and a huge range of suitable products to accommodate all applications while you cannot remove the damaged iron totally you can utilise special paint coatings to stop the rust dead in its tracks and avoid more damage plus get a solid durable coating.
A paint which will stick well like self etching primer is good and it s necessary if you have real rust.
Paint will not adhere to your metal roofing unless you apply an etching primer first.
Removing dirt oil and debris is just one part of a two part process to prepare a tin roof for painting.
The fiber acts a bit like a tire plug in the old nail holes and prevents leaks and it sticks well.
Regular exterior house paint will not protect your tin roof from rust.
I like the fiber in the aluminized roof coat as well as in the black nearly tar roof coat.
Link to product info on amazon first just in the rusted areas if the rusted areas are scattered then paint the whole roof.
You can update your roof and prevent further rusting by cleaning it up and giving it a fresh coat of paint.