You must complete the initial compliance demonstration for the initial compliance period according to the requirements in Sec. 63.4941. The initial compliance period begins on the applicable compliance date specified in Sec. 63.4883 and ends on the last day of the first full month following the compliance date. The initial compliance demonstration includes the calculations according to Sec. 63.4941 and supporting documentation showing that, during the initial compliance period, you used no coating with an organic HAP content that exceeded the applicable emission limit in Sec. 63.4890, and you used no thinners or cleaning materials that contained organic HAP.