Painting and Wallcovering

Our warehouse pull down door is 12 x 12 and we need it to color match the building. We are looking for paint that will not chip off. We operate Monday-Friday therefore, perhaps this would be a weekend job. The owner will need to know name of paint you will use. Will you please provide me with a quote as soon as possible with any additional information so that I may present to the building owner? Thank you kindly!