The present invention concerns a method of lining (4) a container (2) for gas, such as hydrogen, helium, and the like, comprising the following steps: inserting (41) a powder of lining material (P) in a container (2); applying (42) the lining material (P) on the inner surface of the container (2); and fixing (43) the lining material (P) on the inner surface (211) of the container (2).

The present invention also concerns an apparatus (1) for the lining of a tank (2) for the containment of high-pressure gases.

The present invention provides a film forming method comprising: discretely arranging, on a substrate with unevenness, a plurality of droplets of a curable composition in a liquid form containing at least a polymerizable compound (a) as a nonvolatile component and at least a solvent (d) as a volatile component; waiting until each of the plurality of droplets discretely arranged on the substrate combines with an adjacent droplet to form a continuous liquid film on the substrate, and the solvent (d) contained in the liquid film volatilizes, and a content of the solvent (d) becomes not more than 10 vol % with respect to the whole liquid film; and curing the curable composition in the liquid form after the waiting.