Ok, sorry for my misunderstanding , i applied with brush an acrylic matt black paint ( the thinner of this kind of paint is water # alcohol ) , i let it dry one hour and i removed easily surplus of paint with a damp cloth. Water is a soft thinner, it enables to preserve the brilliance of the orange painting. When you use brush, black paint musn’t be diluted , if not it does not adhere with a gloss color .