How to Paint a Fiberglass Tub

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Things You'll Need

  • Safety glasses

  • Respirator mask

  • Screwdriver

  • Isopropyl alcohol

  • Washing soda

  • Bucket

  • Sponge

  • Hand sander

  • Lacquer thinner

  • Soft cloth

  • High volume-low pressure paint sprayer

  • Primer

  • Paint brush

  • Aliphatic acrylic urethane paint

  • Silicone caulk

  • Caulking gun


An informative read regarding the cost-effectiveness of painting the tub rather than replacing is located at

Test the paint sprayer by spraying paint on a large piece of cardboard to get the feel for the operation of the equipment.


Use these chemical products in a well-ventilated area.

Wear safety glasses and respirator mask while completing this project as the fumes can be harmful.

Bring old fiberglass tubs back to life with paint.
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The finish of fiberglass tubs can dull and get surface scratches over time with constant use. The expense of a new tub is not always a viable option. There is an alternative that most homeowners can do themselves. Revitalize the shine and update the look of your bathroom with a little sanding and urethane paint.


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Step 1

Use a screwdriver to force out all old caulking material. Wipe these areas well with isopropyl alcohol to ensure all traces of silicone caulk are gone. Paint will not adhere to caulk.

Step 2

Clean the surface of the tub with a mixture of ΒΌ-cup washing soda and a gallon of warm water. Scrub with a clean sponge. Rinse well with water. Washing soda is available at most grocery stores in the laundry products isle.


Step 3

Use a hand sander to roughen up the surface in preparation for painting. Sand enough to remove the outer gloss finish. Do not over-sand or you will have to do fiberglass repairing before painting. Rinse off the dust and dry.

Step 4

Wipe the surface with lacquer thinner and follow up by painting a layer of primer with a paintbrush. Allow recommended label drying time.


Step 5

Spray the aliphatic acrylic urethane paint with the high-volume, low-pressure paint sprayer. Apply three layers, lightly sanding between each layer. This will create a high-gloss finish. Allow the paint 48 hours to dry and re-caulk the edges using a caulking gun and a high-quality silicone caulk.


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