I got this from the builders advice, He recommends not to use the latex base primer, instead prime the weathered aluminum siding with a thinned down oil based metal priming paint. Leading manufacturers recommend using one pint of paint thinner to one gallon of high quality oil based primer. This primer creates a barrier between the oxidized aluminum and the finish paint. However, before you even think of mixing up and applying this primer, you need to prepare the surface for paint. If you read the labels on most paints, they will instruct you to apply the product to a clean, dry surface. How do you get yourself clean? Soap, I thought so!
He is very helpful, dont you think? I guess he had to throw in the bit about the soap just for good measure
