Bob Smith Plastic-Cure glue. Plastic-Cure is a gap-filling formulation of CA that works best on plastics. It is packaged in a bottle with a brush built into its top, which in many cases is an easier way to apply the CA. As long as brush is put back into the bottle after use, the bristles of the brush will not harden. Care must be taken, however, not to introduce foreign material into the bottle. The brush should not be used, for example, to apply CA to wood that has been freshly sanded. Plastic-Cure will also bond wood, but its brush applicator at times will not be the best way to apply it. Plastic-Cure is superior for the application of false nails and wraps on fingernails, where its brush is the preferred method of application.