u/DeFiClark

Folks
Just tending to my Grumman canoe for the start of the season and over the winter some critter got into the bow and stern compartments and now what remained of 50+ yo styrofoam flotation fill is tiny pellets that are dribbling out.

Looking for advice on how to best repair: the canoe sits on a small pond but in the unlikely event it ever swamps I would not want it to sink. Is there some kind of spray foam or alternative that will fill the compartments but doesn’t require opening them up?