Surface preparation
Surface preparation means use of a cleaning material on a portion of or all of a substrate. This includes use of a cleaning material to remove dried coating, which is sometimes called depainting or paint stripping, for the purpose of preparing a substrate for coating application.
Source
40 CFR § 63.4981
Scoping language
Terms used in this subpart are defined in the CAA, in 40 CFR 63.2, and in this section as follows: