It looks like the existing paint is sound so the preparation would
be as simple as washing with some TSP cleaner then paint.
If the paint is chipping or you have corrosion issues somewhere, you
need to address that prior to painting. The existing factory paint
will serve as a primer.
I had to strip my wife's 1958 Sears 1236 down to bare metal all over
and primed with
RUST-OLEUM 8781502 Gray Aluminum Primer
I had to order it from Amazon.com as none of my local stores carry it.
I suggest a good quality latex paint as it will expand and contract with
the metal more easily than a hard enamel will.
GOOD LUCK !!!
While searching Amazon.com again for some goodies, I found this . . . .
I did not know Rust-Oleum made "marine finish" paints. Might be worth a look
at Amazon if you are interested. Seems like it is not available in my local stores.
There is nothing more grand than
to be just simply messing around
in an old boat . . . . POGO, 1960