Too noisy - clinks and clanks when dishes are being washed or rinsed
. What can be done to quiet it...

The expensive ones have a thick undercoating sprayed on. I doubt that you want to try that now. Maybe there is a paint on substance, something thick and rubbery. I don't know. I would just buy a sink protector, a plastic mat with holes in it that comes in all styles and colors and shapes.