supporting surface 20 it can be convenient to remove the sand or particle material by advantage this can take place by openings 26 in the supporting surface 20 at this location 4 positions 26 is shown however in practices a larger number can be beneficial as potentially can be closable suitable remedy for such removal of leftover particle material can be taken into action on fig6 a crossing point 22 is marked in the reinforcement mesh and a great enlargement such crossing point 22 is shown in the cross section on fig9 in the crossing layer of the fibre bundles there the upper cross section of the fibre bundle 10 a is shown as mainly is a band shape with a certain plain pressure rectangular cross section profile under the fibre bundle 10 a it is also shown altering crossing fibre bundles totally eight layers in this shown example for a crossing point 22 the connection in the crossing point will in this way be very powerful in high degree because of the impregnation and the following curing further more it is of impotence in this connection that provided particle shaped material or sand at position 25 on fig6 not will have the tendency to penetrate in between the layers in the crossing point 22.