I'm not sure if hardener can be used with alkyd enamel . Most cyano-acrylate hardeners were made for use with acrylic enamel. If you do choose to use it, read the safety precautions carefully. "Cyano"- - - -sounds sort of like "Cyanide", doesn't it? Those chemicals are contact poisons, meaning they can be absorbed through the skin as well as being hazardous to inhale, so cover up any exposed skin completely when spraying them and use an activated charcoal "Darth Vader" style respirator. Most professional painters use a full coverage "shoot suit" with filtered outside breathing air supplied when painting hardened acrylics. That might not be necessary for the occasional amateur paint job, but the risks are still there. Alkyd enamel goes through a 30-day "oxidation" process of the binder that holds the pigment to the painted surface while drying, and I'm not sure if hardeners will speed up the process noticeably.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!