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You can probably do two manifolds with one can. It'll be close.
You can cure it in an oven or a barbecue grill. I use a propane torch and play it over the manifold while checking it with a laser thermometer. You have to get it to at least 400 degrees to cure it. If you get up closer to 500 it will begin to smoke some.
I did my first one in the oven at home. Glad my wife was away on a business trip for a few days. Really stunk up the house.