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What about The Stuff (1985)?
Not sure if it was alien or "natural" and was more of a foam than a clear slime...
"Weird yummy goo erupts from the earth and is discovered by a couple of miners. They taste it and decide to market it because it tastes so good. The American public literally eats up the new dessert sensation now known as the Stuff but, unfortunately, it takes over the brains of those who eat it, turning them into zombie-like creatures."
One of my favotire taglines of all time: "Are you eating it or is it eating you?"
Why yes, apples. How did you know? [flickr-photo:id=4347154616] Pusher and member of the Gutter Sistren