bulk capiz shells

What's a good way to fix my capiz shells to a picture.....?

We painted a canvas black and were hot glueing them to the canvas, but when you stick them on the glue makes a darker spot in the middle of the shell, and kinda screws it up..... anyone have a good idea to fix the problem???
see the shells are kinda see through so any glue i would think is gonna make a dark area, unless you cover the entire shell in glue..... maybe that's a thought

If you're using acrylic paint on the canvas, you can use acrylic gel as a glue. It dries clear & will stay stuck to the paint. The best is Golden High Solid Gel - it shrinks less than any other gel, and I've used it to adhere found objects onto paintings.

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