Based on my experience with three foam boards, 1 Blootide performance fish from Wavestorm, 1 Blootide bodyboard from Wavestorm, and 1 Wavestorm Hypergon Bodyboard, yes you need to dry out your foamie every time you finish surfing. The sea water does saturate the foam. Normally people don't realize it and I didn't until I took out the leash plug on the Blootide bodyboard and found the foam wet and rotten smelling after using it twice two months ago. So As I was trying to dry it to no avail for a month I got a new Wavestorm Hypergon which is amazing for a person who has used 2 bodyboards in total, took it out and came back yesterday and laid it flat on my wireframe shelf with the bottom slick up. As I noticed water beads forming on the board facing down over night and it was a significant amount of water, I wiped them off and kept observing the board, within half an hour dozens of new water beads formed on the foam surface and I took a taste it was sea water. So now my brand new bodyboard is going through its first post surf water draining process.
My foamie performance fish was in Princeton Jetty once half a year ago and it still hasn't dried but it doesn't smell rotten yet also it doesn't smell great either. I'm gonna see if I can dry that one too with the same method.
Bottom line, dry your foamie everytime you come back from the surf, the foam is always waterlogged. Put it on an even surface with the foam side facing down, because the slick bottom traps water and can't let it out, and watch the water beads come out until they stop forming. There will still be moisture in your foam but it won't be trapped too badly and hopefully to the point of rotting the board.
Hope this helps as I desperately want my foamies to actually be usable for a while instead of a couple times too. I love these board and how different they are and how different they surf. Also if you spend hours in the ocean the board you come back with is a different weight and float ratio than the board you went in with.
