Also you should not expect professional installers to know how epoxy clear coats might be used to cover tiled surfaces at least not in a thickness significant enough to compensate for differences in tile height.
Best clear coat for tile floors.
In short only use products rated for floors as well as floor type.
Then seal the tile with two or three coats of a clear water based urethane sealer not an oil based sealer which can yellow your.
Glazeguard gloss sealer is developed specifically for ceramic and porcelain tiles.
All of these sealers have their distinct advantages and disadvantages for sealing slate.
It is harder and has the best durability among oil based poly all that it requires is its multiple coats to achieve the level of durability that it saying.
Glossy topical sealers are best applied to porous stone tiles where the sealer can bond firmly with the porous stone tiles.
It will put a clear sealer across the floor tile and grout giving it a high gloss wet look appearance as well as provide a barrier that will protect against chemicals and soiling and make the floor much easier to clean.
Glazeguard ceramic tile sealer is a water based clear sealer that will give the floor a beautiful wet look.
They cannot be removed or repaired by practical methods.
When applying topical sealers to ceramic tiles you risk having the sealer not bond well with the ceramic tile and having the sealer chip or flake away.
Installation is not very forgiving.
The product contains special adhesion promoters that allow it to bond to the hard tile surface after the recommended cleaning procedure.
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Problems with clear coats for mosaic.
You should choose a sealing option that best suits your slate for depending on how you want the floor to look and how much maintenance is required for the sealer chosen.
Glazeguard is water and stain resistant and very durable.
Shown below singlestep by allure is a great floor cleaner and polish for vinyl or even tile floors.
Duraseal poly is a well known brand for flooring gives wood floors its depth and richness while protecting them from dent sand spills.