He wrecked the boat in my opinion.
The foam only adds weight, not bouyancy, making the boat even more overweight.
The foam is not waterproof as far as I know and the can foam I experimented with actually acted like a sponge if water made it past the harder outer coating.
The push in plastic caps are probabky not watertight so water will probably get to the foam.
If you are going to do it, use pour in foam made for flotation.....but remember it will not increase basic bouyancy, just increases rigidity and unsinkability.
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