What is the best adhesive for metal to quartz?
Use a reputable epoxy.
First, ensure both surfaces are lightly scoured, then thoroughly cleaned with an alcohol-based solvent.
However, if you're attempting to undermount a stainless sink, use silicone (properly cleaning surfaces with solvent first). Additional tabs/brackets/supports can be epoxied underneath, but in a way that can allow for sink removal/replacement.
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