coat与coating作名词时均有涂层的意思，有何区别

The front door needs a new coat of paint. 前门要新刷一层油漆。句中的coat可以换成coating吗？
Under the coating of dust and cobwebs, he discovered a fine FrenchLouis XVI clock.
在一层灰尘和蜘蛛网下面，他发现了一个精美的法国路易十六时期的钟。
句中的coating可以换成coat吗？

coating [ 'kəutiŋ ]的英英释义，看第一个意思。当覆盖在某物上是一层覆盖物的时候是可以互换的
n.
a thin layer covering something
同义词： coat
a decorative texture or appearance of a surface (or the substance that gives it that appearance)
同义词： finish finishing
a heavy fabric suitable for coats
the work of applying something
"the surface was ready for a coating of paint"
同义词： application covering

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