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Take glue for instance. That tag is fine on it's own but would it be better or make more sense if it was glues. The ways I could support this would be:
I am more trying to make a case for glues here. Not all word pluralize well and some work just find as it like paper. papers seems wrong.
Since there's 2 primary answers here, if we don't want a complicated "in some cases" scenario:
Crayons, markers, needles, knives, hammers, etc.
Exceptions should be for words that don't quite sound right in plural form, such as "papers".
Crayon, marker, needle, paper, hammer, etc.
Exceptions should be for words that don't sound right in singular form, such as "knife"