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Preparing your resin bathtub for polishing begins with choosing the right sanding grit. Using the suitable abrasive is essential to remove scratches effectively and achieve a smooth, glossy finish.
Choosing the Starting Grit
If your resin bathtub has visible scratches or minor imperfections, it’s best to start sanding with a medium grit—typically around 360 or 500 grit. This level removes most surface defects without being too abrasive for resin. Finer abrasives, such as those found in the Ebonite Abralon Sanding Pads, come in a range suitable for the full process, from initial sanding up to the final polish.
Progressing Through the Grits
After your initial sanding pass, move gradually to higher grits. Advancing through 800, 1500, and up to 4000 grit ensures an even surface and reduces swirl marks. Always clean the surface between grits to avoid contaminating finer pads with coarser particles. Once you reach the highest grit, the bathtub will be ready for polishing.
Tools and Practical Tips
For the most consistent results, use a pad holder or rotary polisher rather than sanding by hand, especially on larger surfaces. Follow up with a specialist resin polish such as the Epoxy Polish System, using a polishing sponge disc for a final high-gloss finish. Work in gentle, even strokes and avoid applying excessive pressure, which can create uneven results.
When This Matters
Choosing the correct starting grit is crucial if your resin bathtub has significant wear or stubborn scratches. Skipping straight to a fine grit will not remove deeper marks and may leave the finish looking cloudy or uneven.
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By starting with the right sanding grit and using a thoughtful progression, you’ll restore your resin bathtub’s shine and smoothness. For full polishing steps and product advice, visit our main guide on how to polish a resin bathtub.