floor the gantry 12 has a winch 26 from which is suspended a frame 28 having a plurality of suction caps 30 which are connected by hoses 32 to a vacuum source not seen in the drawings the workstation 14 has a rectangular top 34 provided with raised sides a suction cap 36 has a weight 38 and is connected to a source of vacuum not seen in the drawings in use of the apparatus described thus far a sheet of glass 40 is picked up by the gantry 12 from a stack 42 prior to being picked up the glass surface is thoroughly cleaned with a suitable solvent the frame 28 is lowered onto the glass sheet 40 and the vacuum source is switched on for the glass sheet to adhere to the frame the gantry is then moved to the workstation 14 where the glass sheet 40 is positioned on the frame 34 with the sheet resting on the edges of the frame the suction cap 36 is fixed to the bottom of the glass sheet 40 and the vacuum source is again turned on downward pressure is applied to the weight 38 and this causes the glass sheet 40 to dish in a central zone as seen in fig2 a measured quantity for a suitable resin 44 in liquid form is poured into the dish a gas permeable and liquid impermeable strip of.