"Thick coating" means a layer of something, like paint or a substance, that is spread on a surface and is not thin or easily removed.
Sentences with «thick coating»
Dogs with thick coats need to be groomed regularly. (thedogclinic.com)
Application was good; due to the textured effect, the polish is quite thick, and goes on in thick coats. (wacie.com)
From its earliest days, these dogs have been known for their distinct blue tongue and heavy, thick coat which makes the breed identifiable in historical references. (dogcare.dailypuppy.com)