Spraying laquer on bare plastic

Laquer paints are hot paints, which means they are self-etching.

Thus they will stick well to unprimered plastic, etc.

They shouldn't burn or distort the plastic unless you might be talking about some of the cheaper figures out there.

Hope this answers your question.

Edmund the best answer is that it can.  Doesn't mean it will.  It depends on the paint.  For example Alclad II paints are very hot lacquer and if you don't prime you are for a world of hurt.  But I have used other lacquer without primer and without incident.  Test it on something first.

Ok, thanks.

But...aren't primers also laquer based? But of course primers are meant to be painted on bare plastic.

And also another question: Will humidity affect acrylic paint drying rate? I live in a humid country, so I can either

paint in the open, or in a air-conditioned room.

One of the problems with model painting today is that there are a myriad types of paint out there.  And one type is acrylic lacquer!  Sometimes a can or bottle will just say lacquer and not identify whether it is acrylic lacquer or cellulose lacquer.

If you want to try a particular paint, best idea is to grab some scrap styrene, or a piece of stock styrene, and try the paint.  See how it works.

With so many new types of paint out there, there is almost no other way.

Even when the type is completely identified, paint makers use so many variants of the basic type, each working different ways, that the old rules of thumb about how to use a given type of paint are becoming useless.