Just clean it and leave it. it looks like a nice factory gelcoat and you'd be amazed at what a little scrubbing, degreasing cleaners and some Acetone will do..
Here's my 29 year old original gelcoat.
If you must "paint" do as SD said and use Interlux 2000E barrier coat in white.. ANY
paint you use in a bilge WILL peel!!!!
Here's my 29 year old original gelcoat..
