Best Solution for Small Exhaust Leaks? Sealant?

[Coastal220]

Hi All,

So I just put a Bosal muffler on my 1970 220, which helped significantly (the other one had rusted all the way through), but it still has a few minor but irritating little exhaust leaks.

I can feel small puffs of air coming out of most pipe connections around the clamps--most are so rusted that I'm afraid to tighten or adjust them in fear of making the problem worse.

Does anyone have experience using exhaust sealant, or is this just a total waste of money? is this the best solution next to having the pipes welded? Also, most of the pipes are so old, I'm not sure a muffler shop would even weld it for me... Thoughts?

THANKS!