Oh no! The dreaded "black spot disease!" It's fatal, Magic, all hope is lost. Your only chance now is to sell me the Seacamp at scrap metal prices.
Seriously, welcome to TFF!! And Shooter has the right of it for getting the spots off, but remember, the operative phrase here is, "rub lightly." I've also used 0000 steel wool and a touch of WD-40 for this purpose, and it too usually works pretty well.