Yes. BUT you can paint or cover the back first, seal it and then use thinset.

Hey Donna!
Glad you "delurked"!
If you use glass that is transparent, yes the thinset will be seen through it. That's not a bad thing though. The color of the glass will be lighter/brighter because of the white thinset under it.
I'm sure others will chime in with more info.
Again.. WELCOME!

Susan

Use the white thinset rather than gray.

Looks great!

You can also line the glass (underside of course) with tin foil or buy venturetape in silver or gold. All the other stuff mentioned also works. But for some glass I love how the foil makes it stay kinda back lit when you use it. Wow another Donna!!!!

Oh and welcome and we want to see some pictures!!!! Your not a lurker anymore ya gotta pony up!!!!

Donna

Hey, glad you came out of lurkdom. WELCOME. SHOW US YOUR BIRDBATH!!!!! Nothing to add to the above advice, except experiment, experiment, experiment. Do small pieces, trying different techniques.

Thank you all for the kind words of welcome. You are all so encouraging and make me feel as though I really can do it! Here's a picture of my birdbath. I took a weekend class at Passiflora Mosaics and came home with a finished project. It was great fun and I can't wait to try something new. Thank again for the warm welcome!
{{!gwi}}
{{!gwi}}

Cadonna, WELCOME! Your birdbath is very striking with those bold colors. I really like it!

HEY HEY!!! that's really pretty. I can't wait to see what you come up with next. Welcome to the addiction

Cadonna, Very pretty birdbath!!! I see the blue flower is the same as one of the flowers in the gift exchange. Very pretty. Good job and hope you keep coming in. We love to see all projects.

Chris

Wow Cadonna that is really striking!!! I love the blues. The plate you used is really pretty. Your pieces around the edge of the bird bath are shaped really nicely. Was that the plate rim?

Thanks for posting pics!!!!

Nice Bird Bath, Love it! Good job! Yup, this mosaic thing is just about being a mad experimentist!!! Go for it!!!

Wow! I LOVE that birdbath. Really impressed with the rim and all those little triangles you had to cut to fit!
The colors are wonderful too!

Very colorful and pretty birdbath!

Barb

Beautiful birdbath..love the colors and design Welcome!

WOW! Your birdbath is really striking! I, too, am impressed with your triangle cutting. Very nice work!

WooooHOOOOOOOO - I missed this birdbath while out of town. What a wonderful job you did on that piece!!!! I LOVE IT. Of course, blue is my favorite color, but you did a fabulous job on this. You REALLY know how to use those plate rims to their advantage. BEAUTIFUL.