To let the substrate or coating get too hot while spraying, by holding the gun too close, moving too slowly, spraying too many passes without breaks or turning off cooling air. A cooked part shows heat tint, high residual stress, cracking or delamination, and on aluminum, titanium or heat-treated steel it can lose strength. Thin walls and small parts cook fastest.
You're going to cook that thin sleeve, give it thirty seconds between passes and get the air on it.
Also heard as
- cooking
- cooked
- overheat
Related terms
Substrate temperature
The temperature of the part being coated, usually held below about 150 °C during spraying.
Cooling air
Jets of compressed air or CO2 aimed at the part during spraying to keep its temperature in check.
Running hot
Booth talk for parameters that are overheating the particles or part; running cold is the opposite.
Standoff distance
The distance from the gun exit to the surface being sprayed, which sets how hot and fast particles arrive.