A kit suitable for use in the field of wound care comprising a dispensable sealant composition comprising one or more parts in one or more sealed chambers for directed or cooperatively dispensing from a cooperative dispensing device, for dispensing to an exposed portion of a wound dressing; and a composite wound dressing, said composite wound dressing comprising: a backing layer having an upper surface and a lower surface and defining a perimeter configured to be positioned over skin surrounding a wound site; a transmission layer provided directly or indirectly to the lower backing layer surface wherein the transmission layer is positioned between the backing layer and a wound contact layer of the wound dressing; a port configured to transmit negative pressure through the backing layer for the application of topical negative pressure at the wound site wherein the transmission layer is exposed at a portion thereof as a result of removing a portion of the wound dressing directly enclosing the transmission layer and wherein the composition is to be dispensed at said exposed portion and to seal the exposed portion (s) wherein the composition is selected from a curing system and a non-curing system and does not flow from its application site but during application is either shear thinning or shape conformable when subject to load, the composition having viscosity in the range 10 - 100 Pa.s wherein a suitable viscosity reduction is achieved when subject to shear forces during application. a dispensable sealant composition comprising one or more parts in one or more sealed chambers for directed or cooperatively dispensing from a cooperative dispensing device, for dispensing to an exposed portion of a wound dressing; and a composite wound dressing, said composite wound dressing comprising: a backing layer having an upper surface and a lower surface and defining a perimeter configured to be positioned over skin surrounding a wound site; a transmission layer provided directly or indirectly to the lower backing layer surface wherein the transmission layer is positioned between the backing layer and a wound contact layer of the wound dressing; a port configured to transmit negative pressure through the backing layer for the application of topical negative pressure at the wound site wherein the transmission layer is exposed at a portion thereof as a result of removing a portion of the wound dressing directly enclosing the transmission layer and wherein the composition is to be dispensed at said exposed portion and to seal the exposed portion (s) wherein the composition is selected from a curing system and a non-curing system and does not flow from its application site but during application is either shear thinning or shape conformable when subject to load, the composition having viscosity in the range 10 - 100 Pa.s wherein a suitable viscosity reduction is achieved when subject to shear forces during application. a backing layer having an upper surface and a lower surface and defining a perimeter configured to be positioned over skin surrounding a wound site; a transmission layer provided directly or indirectly to the lower backing layer surface wherein the transmission layer is positioned between the backing layer and a wound contact layer of the wound dressing; a port configured to transmit negative pressure through the backing layer for the application of topical negative pressure at the wound site wherein the transmission layer is exposed at a portion thereof as a result of removing a portion of the wound dressing directly enclosing the transmission layer and wherein the composition is to be dispensed at said exposed portion and to seal the exposed portion (s)