How to Dye Cast PVC

Dye PVC pipe for refurbishment or color coding purposes.

Polyvinyl chloride (PVC) piping is used extensively in homes and other structures. Primarily used for plumbing and electrical conduit, PVC pipe can be dyed for color coding purposes. Specialized dyes exist for the express purpose of changing the color of plastics from the inside out, penetrating the PVC for a permanent color change. Using these dyes and flexible coatings is as easy as using spray paint, with a few special considerations.

Things You'll Need

• 400-grit sandpaper
• Rubbing alcohol
• Clean cloth
• Vinyl dye or flexible coating
• Masking tape
• Breather mask

Instructions

1. Mask the immediate area around the pipe with masking tape. Put on your breather mask.

2. Rough the surface of the pipe slightly with 400-grit sandpaper if you plan to apply a plastic-specific paint instead of a true dye. Wipe off the pipe section after the sanding with rubbing alcohol applied to a clean cloth.

3. Hold the spray can 10 to 12 inches from the surface of the pipe, or as directed by the manufacturer. Apply a light coat of dye on the first pass; do not expect full coverage on the first coat.

4. Continue to apply light coatings, until the PVC pipe has achieved the desired depth of color.

Tips & Warnings

• A true plastic dye will make the PVC soft for a little while. Do not handle the material while the pipe cures in order to prevent weakening of those spots. Follow the manufacturer's directions specifically regarding curing times and handling.

References

• PVC Fittings Direct: How to Paint PVC Pipe