Weldbond adhesive 160ml 5 4oz the best mosaic glue made.
Glue mosaic tile to mirror.
Glue mirror tile in place and gently press to secure.
You can use either 100 silicon or a knife edge grade epoxy for your adhesive.
I ve done this on mirrors several times.
Measure and mark the center of the plywood square.
Aivs self adhesive glass craft mini square round mirrors mosaic tiles stickers for diy craft decoration 5 x 5 mm 7200 pieces 4 6 out of 5 stars 143 17 99 17.
Found mine in the caulking section at hd.
If that is a negative then you could paint the backs of the tiles a flat black or mask the area of glass that will not be tiled and use a flat black paint to paint the part of the mirror that will be covered with tile.
On jan 28 2017.
I prefer to paint the glass black.
It s very easy to work with and easy to remove.
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Weldbond is the best.
I used it to clue the moulding around my builder grade mirror and it worked beautifully.
It s a water based pva glue has no fumes dries clear and water resistant bonds to most any surface is non toxic and cleans up easily.
Most mosaics intended for indoor use such as this mirror can be made using weldbond and sanded grout.
Clear silicone caulk works great for this.