California Fresh Coat Velvet flat paint is the wood deck paint that holds up for the longest period of time, according to Consumer Reports' testing. The organization's testing found that Home Depot's Behr Premium Plus flat performs nearly as well.
Another brand that performed well under this testing is Valspar's Duramax. Its flat and satin exterior paints are self-priming, which reduces the time and labor necessary to complete the project. Unlike the California brand, Behr and Valspar are widely available and easier to find.
Consumer Reports' accelerated testing process simulates up to nine years of exposure to sun, rain and snow. The testing looks at how well the paint holds up to the elements without looking dirty, growing mildew or cracking.