Dissolving your own flakes in alcohol is much preferable to buying premixed, because you know how long ago it has been mixed. It is very easy to do and is such an integral part of French polishing and applying shellac I would not be intimidated by it. You can leave the flakes to dissolve in alcohol overnight if you are not in a hurry or shake them in a jar with the alcohol (good method when you unexpectedly run out) which takes about half an hour. You can keep the flakes in a dry dark place for decades. The mixed up shellac solution lasts between 6 and 12 months before it begins to deteriorate. You can brush on shellac to seal any unexposed areas of a piece you are going to finish with something else. And if you give a drawer a coat of shellac it does not become smelly after a while unlike most varnishes.