A family member has this old laundry tub with a lot of water erosion around the drain that I want to fix. No leaks thankfully. I am looking for advice on the best product to fill the hole that will be friendly to use for someone new to DIY. I have seen epoxy concrete repair kits and expanding cement recommended for similar issues but wasn't sure what would be appropriate here. I am also interested in recommendations for something that I could apply to completely cover the inside of the tub to hide the repair and current staining.
