support tube 34 and thence through the exit end 40 of the tube 26 the vacuum source then draws air through the exit 40 evacuating air from the bag 44 and creating internal negative pressure which draws resin into the main tube at the entrance 34 the resin flows through the main tube 26 into the resin injection tubes 30 entering the bag 40 and flowing over the surface of the entire layup the negative pressure within the bag 44 causes the resin to be infused into the layup excess resin is carried away by the vacuum tubes 38 through the exit 40 of the main tube 26 as resin begins to enter the main tube 26 motors 38 are turned on causing the entire tool 18 and thus the layup to rotate the rate of rotation will depend upon the size of the tool 18 the composition of the resin as well as the layup however the rotational rate should be chosen such that the tendency of the resin to settle due to gravity is offset or neutralized as a result of the layup being periodically inverted in other wards the forces imposed by gravity on the layup and the resin are periodically inverted such that the resultant vertical force acting on the resin over a period of time is zero as a.