I am building a 1/24 th scale Perkasa,but this recommendation applies to any warship.
Autotek etch primer covers anything with even one coat,and, as an etch primer is good for any substrate including galvanised , ally, plastic / resin.It has an authentic Matt finish,and one squirt repairs any building marks.When finished, I will laquer with Autotek MATT laquer.
Find it on ebay at about £10.50 for two 500ml cans!
Use in well ventilated room,it is acidic!