Just as our Stringed instrument Lacquer in quarts, this aerosol is formulated specifically as a high quality finish for thin, flexible tone-woods such as those used on stringed instruments, made to withstand the expansion and contraction that is characteristic of the unique construction of stringed instruments. Vinyl Sealer is also flexible by nature. Therefore, it is the only sealer that should be used under Stringed Instrument Lacquer. This combination yields great sound and empowers luthiers to finish their handiwork with confidence.