How to finish glass backsplash tile in hard to reach area.

Lea10012150
by Lea10012150
I have two questions. One is how to fill in the tiles in the corner where the counter is too deep to reach the wall. I also ran out of mortar and only have about fifteen half tiles needed to complete the job. Is there something else I can use or can you buy mortar in smaller containers other than 10 lbs.?

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