When board is out of board cover keep emersed in salt water , this will stop delamination .

Sorry couldnt help it .
Bad luck about that , hope it dosent happen to me , I worry about that even going for a flat water paddle in the sun . But I guess the water temp just cools the whole board Including the deck
Having said all that rubbish. , the silver board covers must keep them pretty cool, as there must be heaps of boards on car roofs for long periods ,shorely not all of those delaminate ?