Silicone will bond acrylic to glass pretty good, what I do is put a line of it along the edge of the overflow that goes against the glass, put it in place and suport it over night. then the next day i run a bead along each edge to form a joint like you are sealing a tub to the wall and smooth it over with my finger.
I don't like to use weldon 40 or 16 as to me they are just bandaids for slopy cuts. get good edges and glue with weldon 4 and you can move it in about 1 min instead of having to wait 1/2 a hour for 16 or 40 to set up.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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