There is a phenomenon called 'oil canning' that is part of the manufacturing process. It is something that we try to minimise. In some circumstance however, like a south facing door in low sunlight or car headlights a slight distortion in the finish of the door can be seen. It is caused by stress put on the steel when it is being formed. You can minimise this by choosing a textured door like woodgrain and avoiding high gloss dark colours like BLACK from the RAL range.
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