ya i know all the marketing says they are "low maintence", they are supposed to be easier to repair. If you have a sintered base just have it waxed everynow and then.
Some guys will argue that wax doesn't really help all that much and it may be true. But i find that it is nice to have it done/do it every now and then. I do it myself so i probably wax more then i need to, especially on my sintered boards.