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I have had an unopened tin of Rockhard and the reducer for about 4 years.
Is it still useable? Any guesses as to how long it can be stored?
It's been in the shop, temperature ranging from about 55 to 75 deg. F, (humidity 40-45 RH)

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The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.

If it's still liquid, and has not skinned over, I'd say try it. It would be a good idea to test it first on some scrap, though, just in case. If it dries pretty well (say, in four-six hours) on something like spruce, go for it. My experience is that it an be slow to dry on an ioly wood, taking as much as a week on somew tropical stuff, so don't test it on rosewood or ebony.

Thanks Alan, will do that.

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The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.