No, ceramic is a glazed product. It has no pores and would not allow the varnish to adhere the the surface.
No you should use an appropriate sealant coated on before the tiles are grouted.
Floor tiles are tiles made for use on a floor. They can be made of ceramic, terra-cotta, linoleum, vinyl and other materials. Ceramic tiles are a type of tile made from hardened materials (like clay). People put ceramic tiles everywhere - around the bathroom, kitchen, pools, etc.
tiling new ceramic tiles on a home
The difference between ceramic and porcelin floor tiles is ceramic tyles are make of ceramic and porcelin tiles are made of porcelin. They both come in various sizes and styles. Ceramic tyles are usually better for floors and porcelin tiles are usually better for walls and showers.
you use a tape
Ceramic tiles have a grout "gap" but vinyl tiles shouldn't have a gap.
1"
Probably, it depends on how thick the tiles are. But after awhile they will crack from the weight put on it.
If they are ceramic tiles and this is the adhesive used to bond them, instructions will be on the container.
Ceramic tile I assume? They are grouted together to bond the tiles together and to seal the floor so that dirt does not get between the tile.
That would depend on whether they are ceramic tiles or more vinyl tiles.
as much as ceramic or porcelain tiles
Ceramic tiles are normally laid on a cement base. If the floor has any flexibility at all, the tiles will wind up cracking. But if you do have to install tiles on top of wood, then yes, the wood has to be sealed because the grout is mixed with water, which can damage unsealed wood.