How to seal marble tile mixed with glass?

Question

I recently put up a tile backsplash with mosaic marble and glass tiles. I'm preparing to apply sealer to the stone before I start grouting. It's several hundred 1/2" x 2" to 7" mixed in a random pattern. Here's a photo:

It's going to be nearly impossible to avoid all the glass tiles, but both the sealer and tile instructions clearly state to keep sealer away from glass - any tips on how I can apply this to the stone tiles without mucking up the glass? Alternatively, are there any stone sealer products out there that don't have the glass restriction?

Answer 1

Alternative idea.

Test the sealer on a piece of left over tile.

Let the sealer get onto the glass and wipe it up shortly thereafter.

Compare the before/after -- if you see no notable damage, just put the stuff on and have someone clean up the glass right behind you.

Answer 2

Since you're going to be doing delicate work, it calls for delicate application.

Use artists brushes.

Flat brush for the marble:

Filbert brush for the grout:

It'll be slow but it'll be precise.