There is a special process behind painting aluminum siding. Aluminum oxidizes over time, leaving a chalk like appearance, so the house has to be washed thoroughly. After 99% of the chalk is removed, you must use a specialty primer for all bare, shiny metal areas. Once those areas have been spot primed, we recommend adding a bonding additive to the first coat of the paint. Mix a quart of additive for every gallon of paint. After that, an additional coat of paint will leave your house looking great for up to 15 years!