If you re doing it yourself you will need to clean as much of the old silicone off of the sink as well as the bottom of the granite.
Adhesive for attaching sink to granite.
Granite fitters i know just use silcone to seal.
Since granite is solid rock water intruding into the counter is not an issue.
Silicone caulking is still used on rimmed sink installations to seal out water.
Loctite pl530 mirror marble and granite adhesive is a premium grade adhesive formulated specifically for use in general kitchen and bath applications.
Although several methods are used to install undermount sinks many professionals can safely glue the sink in place using silicone sealant and a two part epoxy.
While tile caulking seals the seams where tile marble or granite meet the upper edges of the sink using an adhesive at the underside of the countertop ensures a proper installation.
The main focus in a rimmed vanity sink installation on granite is keeping water from dripping onto the cabinet below anyway.
Advanced adhesives specifically for granite counter tops are the choice here.
This eliminates the need to drill.
It acts as a protective barrier.
It will not stain or damage mirrors and solid surfaces as other adhesives may.
Depending on how long ago you had the sink put in i d call the builder to have it redone.
The following article explains in detail the 3 most effective undermount sink install techniques used on stainless steel composite and cast iron or clay sinks.
Silicone is a pretty strong adhesive but not that strong.
If so read on.
I am sure i read on here once that a g fitter just silconed the sink in and once set climbed onto the tops and stood in the sink to prove it could hold a sink full of water.
Stainless steel and composite sink manufactures provide a system for attaching directly to the underside of the g q counter top.
The mounting clips secure the sink to the counter.