Thank you very much for the answer. Ask for permission to ask more about the waterproof performance (waterproof level = able to dive, swim for a long time) - Formula 1 - 1) Silicone Film (Long wear,Hard, Isododecane base) 5% 2) Oil-Fix W 2% -Recipe 2 - 1) Silicone Film (Long wear,Soft, Isododecane b...