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The phrase "are watertight" is correct and usable in written English.
It is typically used to describe something that is secure, reliable, or without flaws, often in the context of arguments, plans, or legal documents.
Example: "The lawyer assured us that our case was watertight and that we would win in court."
Alternatives: "are foolproof" or "are airtight."
Dictionary
are watertight
adjective
So tightly made that water cannot enter or escape.
Exact(20)
Examine the joints between the sections to make sure they are watertight.
We handle a lot of sensitive and confidential information so we need to ensure our information security protocols are watertight.
Head coach Charles Van Commenee has said he expects a rash of appeals but believes the selection criteria are watertight.
It's very difficult to write regulations that are watertight when it comes to these sorts of asset sales.
For each country, under the proposed plan, experts will first examine legislative arrangements to ensure that they are watertight.
There is no danger of flooding in the hull because there are watertight bulkheads in this area about every five feet.
Similar(40)
The plant itself is watertight".
"It's watertight," he beams.
Their relationships are or were watertight.
And that, me friends, is watertight".
Safeguards could anyway never be watertight.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com