Gentleman. About two years ago another R22 owner was doing an extensive  
rebuild and posted the exact types and amounts of product to use to replace the  
V-berth foam. I would not want to depend on an air bag to give me the same  
buoyancy as the foam. Air bags are made from various plastic materials which,  
over time will deteriorate from heat, humidity and battery gases. Check the  
archives or ask the list if someone has saved the information. Mixing two part  
foam products doesn't take a technical genius.
 
Rummy