I;'ve found that acrylic paint seems to fill in and smooth out my liquid green stuff texturing ,I've had to go over it 2 or 3 times to finally get the effect I'm trying for . Maybe try another thicker layer ( on a test piece 1st ! ) , then add paint . I think the tow hooks on the front should be base coated steel , if your adding tow cables , they would probably wear away rust to bare metal with all the bouncing around these tanks did when moving If no tow cables , then yea , rust um