This action amends the National Volatile Organic Compound Emission Standards for Aerosol Coatings (aerosol coatings reactivity rule), which establishes national reactivity-based emission standards for the aerosol coatings category (aerosol spray paints) under section 183(e) of the Clean Air Act. These amendments add compounds and associated reactivity factors to Table 2--Reactivity Factors based on petitions EPA received from regulated entities, and clarify which volatile organic compounds are to be quantified in compliance determinations. Additionally, this final rule makes certain changes related to the notice required for a company to certify that it will assume the responsibility for compliance with recordkeeping and reporting requirements for a regulated entity, and it also addresses which party is liable following such a certification. Further, in this action we make minor revisions and corrections to the aerosol coatings reactivity rule. Finally, in this action we are extending the deadline for submitting the initial notifications required in one section of the aerosol coatings regulations for 30 days, until July 31, 2009.