New tub chipped
Most tub manufacturers sell a repair kit specifically for their brands, and usually are the best solution for repairing chips and dings. I would attempt to get their kit if it is available first. Normally, they are provided free of charge for damage discovered after installation, and at reasonable cost for owner inflicted damage. If such a kit is not available, you may have to "wing it"
Here are three possibilities, and I have used two of these.
If your tub is enamel on iron/steel, and you have the chipped out piece, you can reattach it with matching enamel (appliance) touch up paint as the adhesive, and it works as the crack filler as well. Reinstall the chip, and sand smooth after drying with auto wet sand paper, beginning with 800 grit and take it progressively to 1500/2000 grit, until the gloss matches the surrounding surface. This makes an invisible repair.
If the chip is in acrylic, you can repair with a fibreglass repair kit available at one of the home hardware type stores. Again, it is better if you can re use the chipped out piece. If it is available, mix the repair parts of the kit together and butter it into the groove (after trial fitting the chip). Place the chip back into place, and cover with wax paper. Weight the chip to keep it in place until it dries, and wet sand as before. This makes a "close to invisible" repair.
A better repair to acrylic can be made if you can grind some matching surface acrylic (gel coat) to dust and mix the dust with the fibreglass repair resin before re-installing the chipped piece. This makes a closer surface match, leaving the resin surrounding the chipped piece less noticeable. All of the materials used for this type of repair are compatable
If the chipped piece is not available, you can harvest a small piece from an out of view section to make the dust/filler and apply as a paste, filling the chipped area flush and sand smooth as before. This takes the artist's eye to get exactly right, but it can be done. If you cannot get a harvested piece from your own tub, you may be able to get a piece from the store where you bought the tub. If they have a damaged/returned tub, they will usually "donate" a small piece to help you out. I have seen returned tubs be sold for salvage prices.
Just as reference for future use, it is a good idea to cut a plywood cover for the tub, or to line it with cardboard when remodeling to prevent having these type of repirs added to your list of things to do. I learned this a while back, the hard way.
Best wishes. Hope that this was of some use to you.
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