undercoated vs undersealed

undercoated and undersealed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
undercoated	No	Yes	No	No
undersealed	No	Yes	No	No

As adjectives, undercoated and undersealed are synonyms defined as:

undercoated and undersealed: (of motor vehicles) having a coating of tar or other rustproof material applied to the underside

undercoated (adjective)	undersealed (adjective)
(of motor vehicles) having a coating of tar or other rustproof material applied to the underside	(of motor vehicles) having a coating of tar or other rustproof material applied to the underside