Since you mix Hock Shellac yourself you are assured the freshest and most durable shellac available. Remember that because shellac is dissolved with alcohol, a finished surface can be damaged if a strong alcoholic beverage such as whiskey is spilled onto it and left too long. Hock Shellac is an exceptional finish for chairs, bookcases, cabinets, beds, interior trim, picture frames, etc. Sometimes the old ways of doing things are still the best. For your information, I've included the packaged instructions here.
Some finishers adjust the mixture accordingly.
You get the idea. For further thinning, and for cleanup, denatured alcohol is readily available at most hardware and paint stores. Put the jar in a place where you can give it a shake from time to time as the flakes are dissolving. When you can't see any more flakes, your fresh Hock Shellac is ready to use. As with any finishing product, use shellac with adequate ventilation, eye and body protection.