Rust-Oleum Chalked Clear Coating be recoated within 1 hour of the previous coat or after 48 hours has passed. If you recoat before the first application of paint has skinned over and begun to dry to the touch, the two coats will dry correctly. However, if recoated at the wrong time, it may wrinkle blister or crack, which sounds like what you are experiencing. Simply put, to apply a second coat, the first coat must be very dry or very wet - never in between. To fix this, try sanding the surface, wait 48 hours and apply again.
- Rust-Oleum Product Support 3