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It isn't necessary, you can skip it and the part will come out with the same quality as your mould surface.
But really without a coating, epoxy doesn't stay nice for very long. It will likely lose its gloss over time, and it doesn't polish well so you won't be able to polish it up to a full gloss again. It won't stand up to the sun very well either, it will yellow.
In-mould coatings like the gelcoat EC used in their video are great and easy to get good results with, but for a one-off I would suggest just taking your finished bonnet to a spray painter and getting it clear coated with a 2k polyurethane.
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