does it make sense to borrow some ideas from the folks that make these "air swimmers"?
Example: The AirSwimmer's body is made from a high-quality, durable nylon material that will stay inflated for weeks and can be refilled over and over again.
also, use of Ultra Hi-Float Balloon Treatment - 16 oz. to extend the life of the balloon.
Ultra Hi-Float (24 Oz.) by Hi-Float 1.0 out of 5 stars See all reviews (1 customer review) | Like (2) Price: $10.29