This topic is about finding ways to waterproof a two-piece urostomy system for activities like swimming, snorkeling, or using a hot tub. The person currently uses a waterproof tape but experiences moisture under the wafer and skin irritation due to a mild tape allergy. They are looking for alternative methods that won't require daily changes or cause skin damage. Here are some suggestions and insights:

1. Consider using a liquid skin prep to double-coat the wafer’s built-in tape. Allow each layer to dry completely. This method is known to help keep the edges from lifting during showers and can extend the wear time by an extra day.

2. Explore tape-free, pectin-based wafers, which are generally more water-resistant:
- Convatec pure Durahesive wafer (without a tape border)
- Hollister New Image wafers (without tape)
- Most Coloplast wafers (typically no tape)
You can contact the manufacturers for samples and guidance from an ostomy nurse.

3. Combine a tape-free wafer, like the Durahesive, with a clear, thin medical film to seal the perimeter. This type of transparent "second-skin" film is often used by nurses over surgical incisions to keep water out.

4. Use 3M Tegaderm transparent film dressings:
- These are clear plastic sheets available in square or rectangular sizes, not on a roll.
- They are highly adhesive but can be removed cleanly by stretching the film.
- Tegaderm is effective for bathing, swimming, and securing medication patches.
- It is available in the U.S., Canada, and Australia and can be easily found online.

5. If one product doesn't work, keep experimenting with different wafers and a full-coverage clear film. Individual skin chemistry plays a significant role in determining what will be truly waterproof for you.