*Sealing is an optional last step
Sanding your tile floors gives it texture which helps the primer and paint stick better. It’ll be easier to rent an electric sander than using sandpaper and elbow grease.
Jack’s definitely renting an electric sander. No way is he going to get down on his knees on that hard tile for any amount of time
Vacuum up all the dust and debris, then a heavy-duty stripper and cleaner should work. Just follow the instructions and watch your floor become cleaner than you remember! The cleaner it is the better the paint will stick.
Paintable caulk should repair most cracks and damages.
As for the primer and paint to use, the best ones for bathrooms are epoxy paints designed specifically for whatever material your floor is made of.
Seal it with a waterproof sealer if you’d like. The clear, water-based urethane sealants for boats are a great choice if it works with the type of paint you choose and it dries clear.
“One section down, a few more to go,” Jack says under his breath.