Great remodelers and builders consider using galvanized steel studs in locations where there will be tile.
How to hide a huge gap between tile and wall.
With the uneven look you may need to shape the molding to fit.
The steel studs are perfectly straight.
Tool the caulk by drawing your finger along it to form a concave surface.
The only thing to cover the gap would be to use 1 4 round molding.
The line will continue maintaining caulk gap regardless of the gap of the wall to counter.
Fill gaps larger than 1 8 inch.
Choose a color that matches the countertop and spread a thin continuous bead with no voids.
I foresee water getting in the gap and seams when cleaning the floor.
Lay painter s tape along the edge of the countertop and the wall just above the gap to keep caulk off these surfaces.
Your tile person will take the largest gap and run a tape line using that as the thickness or the caulk.
If you have tile on the wall adjoining the tub select a caulk that matches the color of the grout.
If your gap is smaller than 1 8 inch in width use regular caulk.
If installed plumb and square the finished tile work looks amazing.