In article ,
Michael Dobony wrote:

I need to glue a plesiglass shelf to plexiglass sides. I cannot use screws
(visual reasons). What adhesive would you recommend for a long-lasting,
solid fix?

"Plexiglas" is a trade name for acrylic. I've glued a fair amount of
acrylic and I've been happy with Weld-On #16 - "clear, thickened cement
for acrylic sheet."