Epoxy paint designed for bathtub use is difficult to remove. According to BathtubDoctor.com, the only paint stripper strong enough to use on epoxy bathtub paint is methylene chloride. This is one of the strongest and most dangerous paint strippers in use. Before tackling this project, it is important to decide if saving the expense of hiring a professional is worth the safety risk that using methylene chloride will pose. If you do decide to continue with the project, be sure to take all possible safety precautions.
Open all doors and windows around the bathroom. Wear a respirator, safety goggles, and chemical resistant gloves. It is also a good idea to wear long pants and long sleeves to protect your skin. Plug a box fan into the wall. Point the blower toward the window or door inside the bathroom. It is important to have as much ventilation inside the room as possible. If there is a vent fan in the room, turn that on as well.
Mix the paint stripper with an absorbent material, such as sawdust or a powder, until it forms a runny paste. Place a 1/2-inch thick layer over the entire bathtub. Allow the paste to sit for 30 minutes.
Scrape away the paste with a plastic putty knife, along with the paint that the stripper removed. Place the removed paint and paste into an old bucket.
Rinse the bathtub and inspect the surface. If paint still remains, apply another layer of paste stripper, this time waiting one hour before removing the paste.
Scrub the bathtub clean with a scrub brush and a scrubbing cleaner, such as a bleach powder. Rinse the tub with water, and dry the area with old rags.
Dispose of the paint stripper in a hazardous waste dumping site. Contact an environmental sanitation department for instructions on proper disposal for your region. Do not throw away paint stripper in a regular garbage can or down drains.