How to treat rusted metal shed roof?

[Cranswick]

Hi l have some rust on my shed roof, not sure what exact metal is , some sort of corrogated steel, its silver color, When l paint it

with Dulux Metal sheild rust primer ( Below) does it matter if l paint over some of the rust and theres still rust on the roof underneath the primer, will this primer kill or convert the rust underneath? so when l paint on top the rust underneath wont grow back. ALso is Dulux metal sheild the best primer to use if l also want to kill the rust or is there a better one

[EricL]

Hello @Cranswick 

My apologies I thought you were treating galvanized roofing. I suggest following @MitchellMc's recommendation regarding treating the rust on your metal post. The post is often made of standard steel and is galvanized coated. Using the Ranex or White Knight will be ok as the area will be cleaned off with turpentine. Once it has dried off you then cover it with Metalshield Rust Primer.   

If you need further assistance, please let me know.

Eric

[natalie5]

What would you do if once you have cleaned off all the rust if there is a very small hole in the shed roof ?

[JacobZ]

Hi @natalie5,

A warm welcome to the Bunnings Workshop community, it is fantastic to have you with us.

How big a hole are we talking about? Is it a screw hole? Is it the size of a 5-cent piece? Or bigger, like a 50-cent piece?

Do you have a photo that you could share? Let me know if you need a hand uploading images. I'm happy to help if required.

Once the rust is cleaned and treated, make sure you spray the hole with some Cold Gal Spray Paint to help protect it from further rusting.

Depending on whether there is framing beneath and the size of the hole, you may be able to just drive a roofing screw with a dome head washer through the hole. The washer will compress and form a seal over the hole.

If the hole is larger, you could attach a piece of Weatherproof Byute Flashing Tape over the hole. If this is a better option, make sure you give the surrounding metal a good clean with methylated spirits to ensure it sticks well.

For a more permanent solution, you may be able to have someone weld the hole to close it up, or replace the sheet altogether.

Let me know what you think and if you have further questions, please don't hesitate to ask.

Jacob 

[natalie5]

Thanks Jacob!

This was the most useful advice I have had today. I believe it will be about smaller then the size of a 5c piece but I’ll jump up and have a look as soon as I can.

Thanks  again !