Polyester is a chemically cured lacquer which is impervious to solvents and cleaning agents that can damage other finishes, and is the most resistant to scuffs, scratches, and dents. It is extremely hard and therefore polishes to the very highest gloss.
In the past, old types of polyesters had a bad reputation for being overly thick and prone to cracking. The modern polyester used at Spectrum Guitar Finishes is specially designed for instruments and therefore can be applied thinly without compromising its integrity.
Polyester is the finish of choice for players who would like their instrument to keep that perfect new look for the longest period of time.