Found a Ningaloo logo to use for inspiration.

OK, I'm going to unashamedly copy it.
Sketch up layouts

Painting continued, 1 coat per day

Decided the British paints yellow was a dead loss, wiped it off with solvent and started again.
Used Dulux.

Going to draw my design in texta.
Then clear coat.
Texta trials.

That was one of our surveying valve controlled markers.
Impossible to get low enough ink volume.
Although my turtle looks OK.
Braved Bunnings tool shop. (By the way, picked up a rather nifty Ryobi 18 volt stick vacuum while I was there shopping for $3 textas)

Ink flow more controlled.

Several days of fin painting later, should have let it harden for a few days.
Lost patience and wet sanded.

Sanded OK, enough paint, hardened enough.
Straight in to the drawing phase, unsure if the texta was going to bleed through the paint.
First side OK.

Very all or nothing drawing, no second go.
Second side the texta flooded on the tail.

Forced myself to leave it alone, may attempt a touch up later.
Smudged the first side doing the second, tried to hide with additional bits.
But my first Ningaloo fin I am happy with.

I hope I have got the yellow and orange on the right sides....