Floquil paints were enamels.
I don't know about that. The ones that used Dio-Sol as a thinner needed "Barrier" applied first to keep them from eating plastic. I'd say that was something other than enamel.
(Edit) I didn't like Floquil's paint system. First, for plastic models, you had to apply "Barrier" first so the paint wouldn't eat the plastic, Second you airbrushed the main colors, Third you applied "gloss" so the decals would settle properly, then Fourth you applied either "flat" or "semi-gloss" to finish it off. That's four coats of paint and on N-scale models, those four coats definitely obscured fine details and thickened things such as separate grabs, handrails etc. etc. Also added to the expense.
Cheerio!
Bob Gilmore