Abstract: A method for the manufacture of a plastic product, wherein a reinforcement package (2) is placed against a molding wall (1), an air extraction and a supply (5) for liquid plastic material (6) are installed, and the reinforcement package is covered by an air-tight covering (3), on which, non-detachably, channel parts (7) are fixed. The pressure in the reinforcement package is adjusted to a value d1, lower than the ambient pressure, after which the pressure within the channel parts is adjusted to a value d2, lower than d1, so that runner channels are formed on the reinforcement package. After the liquid plastic material has soaked the reinforcement package to a sufficient extent, the pressure in the channel parts is adjusted to a value d3, greater than d1, so that the runner channels are pushed away. After curing of the plastic material, the air-tight covering—if desired reusable and premodeled—and the channel parts connected therewith are released.