I have a red Colorbond roof that seems to be deteriorating. The house was built around 1994 and the roof has faded a little to be more of a dark pink colour than red. But what I'm more worried about is what I noticed when I did a closer inspection this week. On the "bottom" of some of the corrugations near the heater flue the colour has changed to white. In some parts there is bare metal visible and in one small patch (roughly 20mm x 5mm) it's noticeably rusting. What to do? I'm not...

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