Over the course of October at London Heathrow Airport, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 54 minutes, implying an average daily decrease of 3 minutes, 48 seconds, and weekly decrease of 26 minutes, 35 seconds.
Polyester is a synthetic fiber derived from coal, air, water, and petroleum. Developed in a 20th-century laboratory, polyester fibers are formed from a chemical reaction between an acid and alcohol.
They are naturally UV resistant, generally viewed as easy to use, fast curing, tolerant of temperature and catalyst variations, and they are less expensive than epoxy systems. Many view polyester resins as being easy to use because they have a high thixotropic index, basically they do a good job clinging to vertical surfaces so the resin won't run ordrip as much when making parts and molds.