Due to a massive and sudden water leak it was necessary to remove the cabinets. In doing so (removing the sink) I discovered the Previous Owner (PO) used an entire tube of caulk to secure it.
The removal process ended up cracking the curved portion of the backsplash on the countertop. There was no reinforcement behind it, leading me to believe it was just bent and pushed near the 90 degree. I could inject low expansion foam (would be hard) or push in epoxy/acrylic to firm up and reinforce the spot. It is right behind the sink that will be put in, so water proof is more of a concern than most.
Suggestions? Replacement of the entire countertop is not an option at this time.
Edit: Foam suggestion would be to drill a 1/4" hole (size of nozzle) into the back of the wood near the crack and blow a couple of low expansion foam shots in there, hoping to fill it in.