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Achieving a seamless finish on a resin bathtub repair often comes down to attention to detail between each stage. Understanding when and how to sand ensures your hard work delivers a smooth, lasting result.
Why Sand Between Repair Steps?
Sanding gently between each layer or repair stage helps smooth transitions, allowing each applied product—be it filler, resin, or primer—to adhere properly. Skip this step, and you risk creating visible ridges, bumps, or weak spots that may compromise the repair.
- Promotes better adhesion for the next coat
- Helps blend repaired areas seamlessly into the surrounding bath surface
- Prevents unsightly build-up or unevenness
Choosing the Right Tools and Technique
Use fine or medium grit sandpaper (typically P220–P320) for most bath repairs. Sand with light, even pressure, focusing only on the repaired area to avoid scratching undamaged surfaces. Always wipe the area clean after sanding—using a product like the Strong Technical Degreaser—to remove dust and grease for optimal results.
When This Matters Most
If you are working with layered repairs or aim for an invisible patch, sanding between each stage is vital. This is especially true when using reinforcing products such as the Resin Fibreglass Repair Kit, as each layer must bond securely for strength and durability.
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Sanding between repair steps is a small effort that has a big impact on your resin bathtub restoration. For a thorough guide on restoring and repairing baths, see our main advice at How to repair a resin bathtub?