Air-filled flotation devices can replace expanded polystyrene (EPS).
There are already a number of products on the market that provide a more weather-resistant alternative to foamed polystyrene floats.
For examples, see the links below...
Located in Campbell River and 100 Mile House, this company manufactures multiple polyethylene products, including floating structures such as docks, pontoons, and more. The products are made of air-filled polyethylene resin, making them both durable and resistant to environmental weathering.
Upgrading to Air-Filled Flotation is estimated to cost $1,000 per flotation raft, roughly 4x expanded polystyrene (EPS).
Despite the cost to upgrade, there are many benefits that result in cost savings in the long term, including:
longer product life
more robust flotation device
fewer ongoing repairs
fewer repeat installation fees