Hi, I'm sure this has probably been asked before but�

Just finished my kitchen and two bathrooms. I have granite in the kitchen and marble shower saddles, window ledges, and shower shelves in both bathrooms.

Is there ONE sealer I can use for everything? How often should I seal the kitchen-counter granite and the bathroom marble? Should the marble that gets exposed to water be sealed more frequently?

If it matters, the marble in one shower is un-honed Bottcino (would have preferred it honed, but didn't think about it until post-installation); the marble in the other is honed Carrera. Kitchen granite is chocolate bordeaux.

Thanks!