I am consulting on a local sun sculpture which requires that an aluminum backing be glued to 6" x 24" stainless steel mirrors. They can't be screwed on for fear that the screws and holes might distort the mirror, and hence the image. The temperature exposure will range from -20 to 120 degrees Fahrenheit seasonally, and I think that the glue must be able to forgive the small difference in the metals' coefficients of expansion.
Any recommendations? Silicon glue, polyurethane, epoxy, or something else? Thanks- Bill Gottesman
