The company produces pressure-sensitive self-adhesive vinyl films and as official graphics supplier for the tournaments, will manufacture more than 4,000sqm of material, including pit panels, car stickers and other items.
The company said that the contract is worth in the region of €50,000 (£44,300) for the year.
The FIA GT Championship is an endurance championship, run by the Fédération International de l'Automobile (FIA) using performance road cars adapted for track racing.
Hexis wins FIA motorsport deal to supply graphics substrates
French vinyl specialist Hexis has won the contract to produce graphics for the FIA GT Championship, the FIA GT3 European Championship and the GT4 European Cup motor racing events during 2009.