Trim painting

Ok-
I want to paint my lower side skirts(stock) on my civic black to match the paint. I went to the paint store and they told me that they had special primer for plastic and they could match the cars paint by making me a special batch. He told me that it will come out very well and match almost perfect. What do you'all think.

I have to buy a pint of paint for $30

I could also use it to paint my interior pieces, which I thought woould look cool as shiny painted black instead of dull plastic black and grey!!

Ok will you car gods write me back with any opinions and info on this thanks!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!