From the (inactive) MIL spec:
6.1.6 Operating temperature. These coatings are normally useful at temperatures up to 125°C (200°C for type SR), but the useful life of the deposited coating can be extended by reducing the operating temperature. The effect of a humid environment is to reduce the useful life.
SR is silicone, and yours is acrylic.
Thermal shock (specified in another standard) is a 50 cycle test with with exposure at temperature extremes long enough to guarantee it has stabilized (see the table, it depends on mass of the item, as low as 15 minutes), so not very representative of possible deterioration at high temperature:
