it used to be sold in a toothpaste style tube too but it is way thicker. the canned stuff has a brush inside the can lid so thats nice. the tubed stuff can be spread around with a cheap acid brush or similar. it is very difficult to get off so wear gloves.
https://www.canadiantire.ca/en/pdp/p...w.ds#store=611
another good one that I use on metal to metal housing seals
https://www.google.com/shopping/prod...547969129,cs:1
another gasket glue style that works good to hold the gasket in place but doesn't really help the sealing effect in my opinion
https://jbspowercentre.com/products/...tXIzq_M8Eh5BZw
and, of course, the silicone style one. this is the only one I use for silicone when needed. buy a small tube because it goes hard in the container quickly once opened. I have used the pressurized can style before as well, but same deal. it goes bad quick
https://www.amazon.ca/Permatex%C2%AE...4cf87199b&th=1
don't think of your leak repair as a dreaded thing, just start and keep plugging along, soon you wll have it all figured out and if it has to come apart then just start the repair and take it a step at a time. soon you will be done and waiting for the sealer to dry so you can start it up again. i was gonna suggest to ask around if anybody you know has a snake camera that you could borrow but I was beat out, lol.
oh, and post your progress pics.