Never used the permatex stuff but used to do a similar "repair/bodge" on my zephyr 550 base gasket with JB weld.
Would last for about 1000 miles then I had oil spraying on my booties again. Good prep was a difference maker.
Thin cheap wallyworld style 5-in-1 painters tool wrapped in a soapy rag to clean into the crack helped it stick a bit better.
Your leak will be back...soon. Order a gasket and be thankful it's only a thumper.