Bathtubs are one of the most used fixtures in your bathroom. Because tubs are used frequently under the weight of several people per day, damage from all the wear and tear may occur. Acrylic and fibreglass tubs are more widely used these days because they are more cost-efficient than the older cast iron or porcelain versions. Acrylic tubs are also easy to maintain. If damage does occur, repair kits are available at your local home improvement store to easily fix a crack. A kit typically includes a Bondo-like substance or a resin to be mixed for filling the cracks. Patch kits come in a variety of colours, as well. These products seal cosmetic and structural cracks and leave a smooth surface and a shiny finish.
Clean the bathtub before making any repairs to prevent uneven colouring. Rinse well and let the area dry completely.
Sand the area around the crack where you will be patching with a very fine sandpaper (1,500 grit is recommended). Then wipe area with a damp cloth to remove any dust or debris from the surface.
Apply the patching tape, if included in the kit. This holds the edges of the crack together and gives the patching substance something to hold onto.
Mix the patching substance. Some kits will use a Bondo-type substance to fill the crack, while others may use a resin mixture. Add in the hardener and tint and continue mixing thoroughly. Some kits may not include a tint, but instead, add an acrylic paint for application after patching and sanding.
Apply the patching compound to the crack, smoothing the mixture with a small putty knife. Allow the mixture to completely harden. This may take 24 to 36 hours.
Sand the patched area with dampened sandpaper to make the surface as smooth as possible.
Wipe down the area again with a damp rag to remove any debris.
Apply the top coat or sealant included with the kit. This will seal the area and protect it from possible future damage.