Israel Offers Merkava IV Tanks to Colombia

[Juice]

That's a very thick layer of coating. Is it like a add on armor and removable? What is its role?

Most types of "spaced" armor are to defeat shaped charges, or "HEAT"

 

[Oldman1]

Most types of "spaced" armor are to defeat shaped charges, or "HEAT"

Message to Desert Fox
Like you said, its removable to replace damaged ones or upgrade its armor in the future.