Hello! i used my little fin mould two times to add one more extra color…!
I used only the “head” of the fin, i made a hole at the spot that the plastic injected and i made also a little holes to the other side just to make more solid the connection of the two plastics!
This is known as ‘overmoulding’, a common industrial practice and a way of making things from different colours, such as keys on a keyboard (the white part isn’t just printed on, its moulded into the key so it won’t wear off).