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Think it was the "Power Flex" stuff. I've just got some of the Weldtite Anchovies for bigger punctures that sealant alone can't plug, but I'd guess it's not good for sidewall rips.
I've been using Stan's sealant after a brief period experimenting with cheaper solutions from Planet X, which didn't really work. Big bargains on 29" and 27.5" WTB rims at the moment might be of interest to some here, £7.99! Used the narrower version on my cross bike and they seem reasonably solid at a reasonable weight for a very reasonable price.
For those of us too lazy to search, anyone got a link?