It will dissolve some plastics, so test your tank before filling it!
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you cover the top of the liquid with water to stop it evaporating as it is quite volatile.
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Doesn't this contaminate the solution or am I misinterpreting
No, the water doesn't mix, it just floats on top.
And you must use water to cover it, as it evaporates, faster than you can pour it out of the can. I built a large tank to hold 50 gallon about 10yrs ago, filled it up, in the afternoon, came in the next day and the lot had disappeared The gaffer was not happy
We had bought it from eurochem in Goole, as they were only 3 units down from us.
50 litres of methylene chloride in it, with a few inches of water.