Shellac offers advantages and disadvantages. It dries quickly, is easy to apply, looks beautiful on furniture, and is flexible (which is why it has often been used on floors). Its main disadvantages are the fact that it blooms after absorbing water and that it is softened by alcohol and other chemicals. Thus, it shouldn't be used on tables or other surfaces on which drink glasses are likely to be set.
Each new coat of shellac softens the previous coat. This process results in an excellent bonding between the coats. Four or five coats build into a deep single coat because of this bonding. A shellac finish has a warm depth that is highly prized by furniture lovers.
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