For what it’s worth, you should consider using “adhesion promoter” under the red paint. I’ve been using Upol brand adhesion promoter along with rustoleum red for painting the red inserts on hubcaps and stainless and chrome trim on my ‘46 Mercury
From the front, the Australian 1946 and 1947 Fords look similar.
However, the chrome strips on the hood are different - see above photo.
At the rear, the bottom edge of the trunk lid was rounded.
From this detail, you can see that both models are 1947.
I hope that this answers your question.