>>943271 Silicone fails, might be a short term fix, but generally makes things worse.
>>943272 what id the tub made from? Plastic or fiberglass? The point of the sandpaper, is that is a wet-sand 600 grit. After the area is cleaned well and wiped with alcohol, the 600 grit wet sandaper is used to prep the area to be fixed so the epoxy can get a better "stick" to the area.
The sandpaper is such a fine grit, wet sanding, that it doesn't actually take away material of the plastic/fiberglass... well... it COULD if you were to sand on it for hours, but mainly you're just exposing "new" plastic/fiberglass for the epoxy to stick on. Then after the epoxy has cured a little more wet sanding to "smooth" the epoxy to the same level as the old plastic/fiberglass and you can sand up to 2000 grit wet-sand paper which will polish the tub.1553
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