If it's a poly finish, it's really hard to avoid "witness lines" where you sand everything flush. Any nitro applied to an existing nitro finish will "burn in", but not with poly. It's like thin layers of plastic. A Pro refinisher would probably put a new coat of color and clear over the whole bass, but that kind of work is expensive. I've tried my hand and gotten mixed results, hats off to anyone who can do it well. Again, this kind of chip repair depends on expectations. Perfection is nearly impossible, but "Ok from a distance" is relatively easy. For a white bass like this, I think I'd patch the chip, (and any other ones while you are at it) clean and sand the whole bass to get some "tooth", and rattle can it with new white and clearcoat. To do that right you have to be patient enough to let it cure for a few weeks, unless you do some kind of UV activated finish.