FIBERLGASS CRACK REPAIR | HOW TO REPAIR A CRACK IN A FIBERGLASS BATHTUB USING FOAM & BONDO GLASS

Introduction

This tutorial will guide you through the process of repairing a crack in a fiberglass bathtub using foam support and Bondo Glass. This method is effective for restoring the integrity of your bathtub, ensuring it remains functional and visually appealing.

Step 1: Gather Materials

Before starting the repair, ensure you have all necessary materials ready. Here’s a list of what you will need:

• Bondo Fiberglass Resin
• Bondo Fiberglass Mat
• Bondo Glass Short Strand
• Loctite Foam Gap Filler
• Sandpaper (assorted grits from 120 to 3000)
• Bondo Spreader Pack
• Primer (Zinsser 1-2-3)
• Paint (Rustoleum Tub and Tile White)
• Caulking (DAP Stretch)
• Mixing cups
• Paint brushes

Practical Tips

• Always wear safety gear, including gloves and a mask, when working with resin and chemicals.
• Ensure your work area is well-ventilated.

Step 2: Prepare the Area

• Clean the crack and surrounding area thoroughly to remove any dirt or soap scum.
• Sand the area around the crack to create a rough surface for better adhesion.
• Use a tack cloth to remove any dust after sanding.

Common Pitfalls

• Skipping the cleaning step can lead to poor adhesion, weakening the repair.
• Ensure the area is completely dry before proceeding.

Step 3: Apply Foam Support

• Use Loctite Foam Gap Filler to provide support behind the crack.
• Fill the crack with foam and allow it to expand and cure, providing a solid backing for the repair.

Practical Tips

• Apply the foam in layers if the crack is deep, allowing each layer to cure before adding more.

Step 4: Mix Bondo Glass

• In a mixing cup, combine Bondo Glass Short Strand with the hardener according to the manufacturer's instructions.
• Stir thoroughly to ensure an even mixture.

Step 5: Apply Bondo Glass

• Use a Bondo spreader to apply the mixed Bondo Glass over the crack and foam support.
• Make sure to feather the edges to blend smoothly with the surrounding area.

Practical Tips

• Work quickly; Bondo sets fast, and you want to achieve a good finish before it hardens.

Step 6: Sand the Repair

• Once the Bondo has cured, sand the area smooth using your assorted grit sandpaper, starting with a lower grit and finishing with a higher grit for a polished look.
• Be careful not to sand too deeply, as this could damage the fiberglass.

Step 7: Prime and Paint

• After sanding, clean the area again to remove dust.
• Apply Zinsser 1-2-3 primer to the repaired area to improve paint adhesion.
• Once the primer is dry, apply Rustoleum Tub and Tile White paint for a finished look.

Practical Tips

• Apply multiple thin coats of paint for the best finish, allowing each coat to dry before applying the next.

Step 8: Final Touches

• Inspect the repair for any imperfections and touch up as needed.
• Use caulking around the edges if necessary to ensure a watertight seal.

Conclusion

Repairing a crack in your fiberglass bathtub can extend its lifespan and improve its appearance. By following these steps, you can achieve a professional-looking repair using readily available materials. Remember to prioritize safety and take your time throughout the process for the best results. Happy repairing!