Jumbo i assume that you are fitting the spoiler yourself in which case the foam pieces on each end need to be left on for painting but removed prior to fixing as i think that they are used as hanging mounts when spraying(see the small screw holes) and to create the required depth for the glue to sit in, the supplied glue is ok but there is better stuff like Sikaflex and the paper section you refer to fixed to the edge IMO needs taking off after painting as it then gives a nice clean edge for bonding this is what i did with mine pre facelift spoiler though hope it helps.