There is provided an apparatus (2) for the forming or curing of a fibre-reinforced polymer composite material (10). The apparatus (2) comprises a first layer of material (4) positioned to overly the fibre-reinforced polymer (10); a second layer of material (6) positioned to overly the first layer (4) to define a chamber (8) therebetween. The apparatus (2) further comprises a vapour source (16) and a fluid communication path having; a transfer section (18) in fluid communication with the vapour source (16) and chamber (8), and, a return section (20) in fluid communication with the chamber (8) and the vapour source (16).