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Hi - 1999 Lund Alaskan 18 ft.  Floatation is water logged. looking at redoing it all.   Looks like I can access by pulling floor and the top of the side storage areas.  Does anyone know if there is also floatation in the area under the splash guard by the transom?  This area is all metal and riveted, so no easy access to replace.   Right now, the boat is about 200 lbs heavier than it should be and the stern sits heavy in the water.
Any and all input welcome....
Thanks
Dan 

I believe there is floatation all the way back under the floor. I have had 2 18' Alaskans and replace the floatation with empty 2 litres

Thanks for the response. I was thinking or putting empty bottles with tops on in the areas, then filling with closed cell foam. Did you just do bottles? Worked ok?

Just bottles.  The boats never sank so I guess it worked out