Floatation bags

I'm wanting to change the foam floatation for floatation bags.(mice have been an ongoing issue keeping me off the water).  Has anyone done this in the past?  The scot has 600lbs of floatation right?  Is that all in the foam blocks?  Thanks in advance.  I've searched and searched and can't find much. 


If mice are eating your styrofoam  floatation try covering the flotation with chicken wire . WE had a chipmunk problem getting inyo our covered motor boat in the winter and a chicken wire cover was our only solution after other measures ( mothballs, pepper) failed