If the boat is still original gelcoat, then you can just paint straight onto it (following cleaning/keying) with a suitable marine gloss, e.g. International Toplac. Two-pack paints are also available at greater cost but will be more hardwearing.
The thing to watch is that you don’t put 2-pack paint onto normal paint- the solvents in it aren’t compatible.
There are quite a few different marine paints available e.g. Hempel, International, Epihpanes, Teamac. But I don’t think there is a specific one for Wayfarers 🙂