Porcelain Repair Epoxy Kit – 5.6 oz for Chips, Cracks & Scratches on Tub, Sink, por | 19 Jul 2026Once cured, the epoxy forms a robust, water-resistant surface that resists yellowing. It can be sanded smooth using the included multi-grit sandpaper. Durable and Smooth Finish After Curing. Hairline cracks.