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Yes, you can install a backsplash directly onto drywall, provided the wall is properly prepped, clean, and dry. For best results, especially in kitchen areas, your walls should be made of moisture-resistant drywall, often called green board. If your current wall isn't moisture-resistant, it's recommended to replace it before installing the backsplash. For even greater protection against water damage, you can remove the existing drywall and install a tile backer board or cement board instead. While properly installed standard drywall is typically strong enough to support a backsplash, some local building codes may require water-resistant materials in kitchen areas, so it's a good idea to check.

Like glass tiles, you will not need to seal most porcelain tiles, particularly if the porcelain is already glazed. It depends on quality. Porcelain is very water resistant, but it is not 100% waterproof. To avoid staining, some homeowners use a penetrating sealer. It is also a good idea to seal your grout. Unless you use epoxy grout, grout is very porous and can harbor bacteria, mold, and mildew.

Whether you use a brush or roller depends on the size, shape, and amount of tiles. Rollers are easier to maneuver over large areas and can apply a more even coat of paint in a shorter time frame with no visible brushstrokes. Brushes are best for precision work, particularly in very small areas. If you don't want visible brushstrokes on your painted tiles, you can paint details with small foam brushes instead of bristled paint brushes.

Per the International Code Council, walk-in shower floors should have a minimum slope of 1/4-inch per foot (or a 2% slope) towards the drain. The slope should be no steeper than 1/2-inch per foot (or a 4% slope). This helps safely direct water into the drain rather than all over your bathroom.