Since it is carrara marble a white marble it can contain embedded iron deposits and you need to seal both the tile and the grout in the shower.
Is it necessary to seal marble tile.
Unlike a ceramic or porcelain tile floor it s not just the grout lines where sealing is critical but the entire surface.
You can apply another coat of sealer on the tile too.
White marble including carrara and calcutta marbles often contain small deposits of iron.
As polished marble has very little chance of water absorbency there is a much less chance of staining and therefore sealing is not really necessary.
In addition if the marble is not absorbent then it will not absorb the sealer and the sealer wont work.
A major consideration when deciding whether or not to seal your marble shower is that hard water stains are a common theme in bathrooms specifically in showers and baths.
The same process used to seal marble floors can also be used to keep a marble countertop sealed against stains.
The first instance is when you have put white marble in your shower.
As polished marble has very little chance of water absorbency there is a much less chance of staining and therefore sealing is not really necessary.
There are a few different circumstances that will require you to seal marble shower tiles.
While not all marbles are delicate most are highly absorbent and thus easy to stain and etch.
Polished marble shouldn t need sealing before you apply.
Many manufacturers do not seal the tile ahead of time so try this simple test.
Shake a few drops of water on one of your tiles.
I would seal the tile before grouting.
When should you seal marble shower tiles.
Marble sometimes gets circulary etches scrathed into its polished face with sanded grout.
How to seal marble floors before grouting.
Sealing marble or any other kind of natural stone tile is a very important and step that is often done at the wrong time or omitted altogether.
Then grout using non sanded grout.
Then wait 3 days minimum after grouting giving time for grout to cure and then seal the grout.