Originally Posted by DanTwoLakes
Marine grade and automotive grade are pretty much the same. They both need to repel dirt, oil, mildew, and be UV stabilized. Some vinyls may not have the mildew resistance and still are automotive grade. They can't be marine grade if they're not mildew resistant.
So wouldn't it make sense to opt for the marine grade if it's available in the color or pattern that you need?