sealers do more harm than good. If you're not sure whether or not to apply a sealer, check the manufacturer's recommendations on the grout container.
In terms of entirely removing grout fromceramic tile, if you indeed have unsanded grout you will find the task a whole lot easier. Unsanded grout is easier to penetrate withstandard grout removal toolsand clumps up more during removal. Sanded grout is a whole lot more stubborn and comes out...
Flip the fire pit over and tile around the rim(this section was resting on the work surface as you tiled the bulk of the fire pit). Let the adhesive dry. Flip the fire pit back over and apply grout to the crevices between the mosaic tiles. Your grout float works well for this, but...
It's importantto perform the simplewater testto determine if/when your marble countertop or floor tile needs sealing and then apply a sealer only when indicated. Applying it "just to be safe" is a recipe for trouble possibly leaving a hazy film on the surface. ...