How to Repair Cracks in an Acrylic Spa

One of the main advantages of owning an acrylic spa is that its smooth, glossy finish gives the spa shell surface an eye-appealing sheen that is easy to clean. Typically, a spa consists of two layers sandwiched together; the shell surface, in this case acrylic, and its understructure, most commonly consisting of a combination of fibreglass and additives. While these two materials should grant structural integrity and longevity, cracks are always a possibility. Thankfully, should cracks appear in your spa, there are some strategies to repair them and restore the glossy finish.

Clean the acrylic tub thoroughly, concentrating on the areas that need to be repaired. Be sure not to leave any cleaning solution residue on the surface before repairing. Allow the tub to dry completely.

Open the Plast-Aid Multipurpose Repair Kit and mix a sufficient amount of Plast-Aid powder and liquid using the mixing cup included in the kit. Use a mixing stick and stir well.

Find an acrylic paint that matches the colour of your spa's shell. It may take some trial and error to find the right colour. Mixing a few colours may be necessary. Add the paint to the mixture.

Scoop out the mixture onto a plastic putty knife and smear on the crack, filling it evenly. Allow the mixture to dry.

Sand the area using the fine-grit sandpaper to make the surface even and smooth again. You should be barely able to see the crack when sanding is complete.


If the Plast-Aid powder gets on your skin, it can easily be wiped off or removed with water. If the Plast-Aid liquid gets on your skin, your skin may whiten. It is best to wash your hands with soap and water. If the Plast-Aid hardens on your fingers, it will crumble off as it sets.


Never use paint remover, thinner, acetone or harsh cleaning products on acrylic tubs. Do not use oil-based paints. Do not use a metal putty knife or you may risk scratching the spa's surface. Plast-Aid can irritate some people's skin causing redness or rash. Use adequate ventilation when using Plast-Aid.

Things You'll Need

  • Plast-Aid Multipurpose Repair Kit
  • Artist's acrylic paints
  • Mixing cup
  • Mixing stick
  • Plastic putty knife
  • Fine-grit sandpaper
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About the Author

Adrienne Farricelli has been writing for magazines, books and online publications since 2005. She specializes in canine topics, previously working for the American Animal Hospital Association and receiving certification from the Certification Council for Professional Dog Trainers. Her articles have appeared in "USA Today," "The APDT Chronicle of the Dog" and "Every Dog Magazine." She also contributed a chapter in the book " Puppy Socialization - An Insider's Guide to Dog Behavioral Fitness" by Caryl Wolff.