Solid Surface vanity and Undermount sink

My contractor works with the countertop place who sold me a Hi-Macs solid surface vanity. When I wanted a Kohler undermount sink they made it sound like that was very unusual and they wanted to charge me $150 to install the sink onto the countertop. What they ended up doing is making a plywood deck that the sink sets in then the countertop sets ontop of this. It's not installed yet so I don't know how it will turn out.
question is...what's the usual way to install a porcelin undermount sink onto a Hi-Macs countertop? The kohler documentation says "no epoxy" and to use the countertops recomendation for attachment.
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Have you checked the Hi Macs site?

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first build a cradle on the inside of the vanity (around perimeter) install top of cradle below vanity top (the thickness of the sink plus 1/16") place sink in/on cradle use 100% silicone (clear or color to match sink) around sink perimeter and dots the size of a nickel on vanity sides, front and back. place Hi-mac top over sink. let sit over night before installing fixture.
a cradle for any undermount sink is a must, for sink replacement. most people do NOT think of replacement. I can't tell you how many countertops I had to remove just to replace the sink. a vanity top is not to bad to remove. it's the granite (kitchen) tops that are a pain in the ass.
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