[Figgeman]

A few days ago I discovered a small, dark spot on the back part of the roof. It turned out to be rust. For some reason, there is a small hole in the painting with small cracks around the hole.
A rock that bounced in an unfortunate direction? Maybe. But I have not one single spot from rocks anywhere else on the car. And rust? RUST? The car is nine (9) months old. I learned that roofs are not galvanized, and that means there will be rust if something like this happens.

Not the worst thing that could happen, by far - but quite annoying. It has to be fixed before the rust expands.

 

[Granis]

A few days ago I discovered a small, dark spot on the back part of the roof. It turned out to be rust. For some reason, there is a small hole in the painting with small cracks around the hole.
A rock that bounced in an unfortunate direction? Maybe. But I have not one single spot from rocks anywhere else on the car. And rust? RUST? The car is nine (9) months old. I learned that roofs are not galvanized, and that means there will be rust if something like this happens.

Not the worst thing that could happen, by far - but quite annoying. It has to be fixed before the rust expands.

Can be an idea to try to consult with your dealer. Maybe it can be covered by the paint guarantee. I recently had my CX5 repainted on the roof due to rust.

 

[Figgeman]

Wrong post.

 

[Figgeman]

Can be an idea to try to consult with your dealer. Maybe it can be covered by the paint guarantee. I recently had my CX5 repainted on the roof due to rust.

What was it that caused your rust?

 

[ASH8]

A high flying stone or small rock with sharp edged (like road gravel) will usually crack outer clear coat and if hard enough to penetrate through undercoat and expose bare steel then yes that bare steel will start to rust almost immediately, visually to human eye in about 48 hours, depends on humidity, rain, etc.

Mazda's water base paint like most brands in only 100 microns thick (including undercoat), that is the thickness of a $100 euro note. Looks great but it is not a Rolls Royce quality.

As a Mazda man all my life their paint quality (thickness) is my biggest issue with the brand, its rubbish.

Also why the brand (like many) have plastic fender liners and arch liners, plastic undercovers and mouldings to protect paint from stones and rocks.

If you hear a high ching or ting noise it is usually a stone hitting metal, if you can locate the chip and clean with a wipe (alcohol) and tough up paint chip with Mazda touch up paint.

 

[Figgeman]

A high flying stone or small rock with sharp edged (like road gravel) will usually crack outer clear coat and if hard enough to penetrate through undercoat and expose bare steel then yes that bare steel will start to rust almost immediately, visually to human eye in about 48 hours, depends on humidity, rain, etc.

Mazda's water base paint like most brands in only 100 microns thick (including undercoat), that is the thickness of a $100 euro note. Looks great but it is not a Rolls Royce quality.

As a Mazda man all my life their paint quality (thickness) is my biggest issue with the brand, its rubbish.

Also why the brand (like many) have plastic fender liners and arch liners, plastic undercovers and mouldings to protect paint from stones and rocks.

If you hear a high ching or ting noise it is usually a stone hitting metal, if you can locate the chip and clean with a wipe (alcohol) and tough up paint chip with Mazda touch up paint.

Not good.
I think this spot must have been there for a while since the paint has cracked around the spot.

 

[ASH8]

Yes, that looks like a big stone chip to me and that crack look is 'normal', much depends on how long.
From pic I cant see rust (orange), but definitely get it seen to, good luck.