One drawback to thermoplastic materials is that they are sensitive to environmental changes — especially the alkyd materials used extensively throughout Texas. Many sources state that surface moisture and air temperature are the two most important factors that influence the long-term durability of thermoplastic markings. Thermoplastics are especially susceptible to moisture-associated bonding failures. Therefore, thermoplastic materials may not be the best material for pavement markings in locations that are very humid or susceptible to dew formation during times that would affect striping operations, such as striping at night. Thermoplastics should also not be used unless the pavement temperature is 50°F and the air temperature is 55°F. Thermoplastics perform better than standard traffic paints in areas where snowplowing is common but still suffer some loss in durability depending on the number of snowplow passes.