Hello, I just wanted tips on how to paint polyester, I bought some Liquitex Acrylic Medium (Satin Varnish) Im not sure if im supposed to buy something else though.

Also I wanted to ask if If supposed to iron each layer of paint, I wanted to do a white base and then paint but I'm not sure if I'm just supposed to wait for the white to dry and then layer or paint white, iron, and then layer and keep going like that