Warning: Wound images. 1 Primary Wound Dressing can be used to treat all wounds that heal by secondary intention, like post-surgical wounds (including pilonidal sinus), leg ulcers, pressure sores. 1 PWD is also suitable for very deep wounds due to the induction of granulation tissue. This video demonstrates the use of 1PWD on a post-surgical wound with exposed bone after removal of a malignant tumour. The spray is avialable in 10ml or 17ml online, on prescription or ask your pharmacist.