While both seem to have some good reviews left by the customers, Permatex appears to have better overall customer rating score than Dynagrip.
Here are the links:
Dynagrip
https://www.supercheapauto.com.au/p/dynagrip-dynagrip-extrem…
Permatex:
https://www.supercheapauto.com.au/p/permatex-permatex-cold-w…,
any stock around?