Leaking Coolant from Filter Head Threads - Sealer?

[TrueBurner]

Got a coolant filter head from CDD and just got on to putting it on. Of course I didn't think of putting any thread tape or sealer when I installed it. Not speaking on what the coolant filter itself screws into but the threaded side of hose ends that screws into the top of filter head. Any recommendations on what to use to stop the leaks?

 

[Clb]

Rector seal

 

[TrueBurner]

Thank you! Any specific one? I'm seeing some forums now that Soft dry 5 should work great