A good scraper might also help. I've got a couple 1-inch wide gasket scrapers off the snap-on truck, and I wouldn't be without them.
They're about 10-inches long, have a screwdriver handle, and a good stiff scraper with a beveled edge at the other end. I think they make them up to 2-inches wide. WELL worth the money--you'll use it a million times for everything from this to undercoating to sound deadener. And the occasional gasket.
On my second one, I rounded the edges of it on my bench grinder so the corners don't dig in.

Good luck.
-Brad


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