Piano black with no grain showing will require many coats of sandable primer. You can use spray cans but pro automotive primer will be better. Slightly ease all sharp edges before applying primer. Build up the primer sanding between coats with 200 grit wet or dry paper using a flat sanding block. Always keep the sanding block flat. Stay off the edges. Once sealed wet sanding can be done.
Once you have the primer built up so no grain is showing, I would give it another coat and sand with 400 grit paper.
Then you are ready for the black lacquer. I use automotive paint which will look the best and be very hard. Real lacquer has been outlawed by the EPA so it will probably be acrylic lacquer. You can probably do the job with Rustoleum Hardhat spray and have a decent looking finish but pro automotive paint would be better.
If using pro paint, you must mix with thinner and maybe a catalyst to harden the finish. You will need a good sprayer and compressor with a moisture collector or an airless sprayer(preferable) Wipe down the table with a tack rag and apply three coats of finish about fifteen minutes apart. Let harden overnight.
The finish will probably have a slight orange peel and not be very glossy. Using 400 wet or dry paper sand till nearly smooth. Be very careful on the edges, just sand slightly. Using water while sanding makes it easier just be careful not to get it where it shouldn't be. Then go to 600, 800, 1000, 1200 and 1500 grit. After that it needs to be buffed with swirl mark remover. You can also apply a clear coat if wanted.
It's really pretty simple.
