yes
you can paint over latex paint with latex enamel.
Lacquer can cause the paint to bubble or crack due to the very hot solvent that is a part of lacquer. If you want a clear coat over paint, a better choice is spar varnish over oil base paint and arcylic urethane over latex.
Yes, enamel paint will go over flat paint.
Enamel paint is basically a type of oil based paint. It can be defined as a semi or high-gloss paint that levels out all by itself. You spread it evenly with a brush, and then the strokes vanish; it forms an enamel surface. It works superlatively on a distinctive primer that equalizes the surface.
Why are you asking me 'cause I don't know!!!! hmmmmm. they should be, though.
yes
yes
Yes, with enamel paints.
It is a semi-gloss texture enamel.
emulsion paint: paint in which the binder is dispersed in water. enamel paint: pigmented varnish, glossy coating
No, you can't.
Enamel paint that has dried on a surface is no more or less flammable than other top coats. Many of the chemicals in enamel paint are combustible under the right conditions. It is advisable to store unused enamel paint, and many other household chemicals, in a safe environment.