This was the second pot foam I've bought, the first wasn't quite enough and expanded more slowly. This product was much faster and cured within 5 minutes. Worth the money and works great as a floor foam on my John boat.
Pros
2lb Marine Grade Foam: Closed cell foam ideal for buoyancy, insulation, soundproofing or void fill. Approved by the US Cost Guard, this potting foam is ideal for use in floats and boat parts.