Comment by PaulRobinson

In my experience, stirring within the first tens of seconds of submersion is enough and it won't stick together again for the rest of the boil. After it's strained is a different matter, but you might as well wait until then if you're going to oil it.

Doubtful because it just floats on the surface. Maybe ones you pour the water out?

Which doesn’t really work as the oil and water won’t mix.