Proseal max tempurature and pressure ratings?

[RVFan671]

Have some old proseal from my RV-10ER tank build and a forklift on its last leg with plenty of issues but less than 10hrs per year of use. Rather than fix er up proper, was wondering if proseal would fix small radiator leak. Will it withstand radiator fluid and the potential pressures faced by a cooling system and 200ish degrees? Thermostat is 180 degrees but figured it might get warmer then that in the engine bay.

 

[FireMedic_2009]

Not applied to the outside even if it could handle the temperature, the pressure is too much. It shouldn’t be hard to braze the leak