This is a common question and the answer is NO. If you have a matte finish tile don’t try to make it something it is not, you will be sorry. Sealing tile surfaces applies more to natural stone or Mexican clay tiles which are porous.
If you apply gloss sealer to ceramic or other none porous tiles it will not bond properly and will lift in some areas. The first areas that will show signs of lifting will be the high traffic areas. Next any areas in which furniture is moved such as kitchen chairs which will show scuff, scrapes and wear.
The final disaster is after a short time the floors will begin to darken and look dirty. Visit our photo gallery to see a good example of what sealing tiles can look like both before and after stripping.
The only remedy for this situation is complete tile and grout stripping which is a bit more expensive than just cleaning the tile.