The activator solvent is acetone, so that could melt some weak plastics, but you'll clearly see, probably be fine for anything on a PCB.
Activator active ingredients copper salt and Aliphatic amine. Maybe if it really did spray everywhere that would be concerning and should be cleaned off. But it seems quite thin?
Cyanoacrylate glue should be safe for the PCB itself.
In the future use the brush on activator version instead, or kapton tape.