Just bought a second-hand carbon fibre kayak and am looking to give it a paint job. What's the right kind of paint (on a budget) for this in your opinions? Thanks in advance!
You don't paint carbon kayaks.
If there's a coloured gelcoat you can repair that, otherwise you can use fablon (other self adhesive coloured plastics available) to recolour. The joy of fablon being that if you want a new colour next week it comes off with a hairdryer.
This isn't a solution to a damaged hull. Ensure that any gelcoat or resin fully covers the hull and there are no exposed fibres.