Varnish and Paints - Boat use.. what type?

Tidying up the inflatable and just been shocked by the price of boat specific primer, paints and varnishes!

Need to varnish the Keel which sits inside the boat. Will get damp. The bottom edge sits against the boats fabric so may stay damp. Any advice re. type of varnish to use?

Part of the deck is Plywood as is the Transom. Transom will be in water when i use but will dry out between trips. Deck will get wet but again should dry out during use. To save money plan to use the same primer and paint on both deck and transom. They were originally coated with Black Paint but top of transom and deck have flaked in some areas so rubbing back, priming and the painting.

Just want bog standard varnish, primer and paint that are resiliant enough for marine use. The local boat shop has a confusing selection of expensive paints and varnishes and most require special thinners etc which adds to cost!

Any advice? thanks.

thanks Foxfish! ,

The packaging is slightly confusing! Please can you tell me .. Can this be used on Wood? Can it be applied on bare wood? , and can it be used over exsisting painted surfaces.

Yes boat ownership comes as a bit of a shock!!