Plumma’s Red Prime Fluid is a solvent based product which is specially formulated to clean and prime PVC-U pipes and fittings, so they are free of dirt and grease. The application of PVC Pipe Priming Fluid is essential preparation prior to the application of PVC Pipe Cements to ensure a satisfactory bond is achieved. It is fast drying and leaves a pinkish stain to indicate where the PVC pipe has been correctly primed