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My local hardware store sells:

Rust-Oleum Ultimate Polyurethane Clear Gloss Spray Paint
Valspar Clear Clear Gloss Spray Paint
Crystal Clear Gloss Spray Paint
Rust-Oleum Crystal Clear Gloss Spray Paint
Rust-Oleum Ultimate Spar Varnish

Has anyone used any of these? Would any of thes be good for minis? Should I avoid any of them?

Most gloss paints will be fine as long as your paints are dry completely. There isn't much done to clear glosses which would set one apart from another (they are all pretty much pure binder of what ever flavor they are made from).

That said - I have used the Rustoleum Crystal Clear several times and have never had a problem with it. It creates a rock solid coat which is clear and shiny.