The best way to do that then is give everything a basecoat with gray automotive primer. I like the sandable kind since it leaves a little more "absorbant" texture. Then try your acrylics.
I have used Spaz Stix as well. I have a lot of their paints. And it still wouldn't be my first choice for a boat, unless it was a speed boat or something flashy. Their color selection just isn't nearly as diverse as a lot of other brands. I mean, if he wants bright colors, or black or white...
That may be past problems he'sfaced with other projects, but he states his current project is a plastic boat. Not sure I'd want to paint that with Spaz Stix or Duratrax since those are more aimed at model automotive applications. That's why I also said we need clarification, because there are...
@thatwelderguy69 - are you wanting spray paint or are you brushing the paint on? Are you using a brush with airbrush paints?
You guys read he is painting a plastic ship right? Not an RC car? It's hard to recommend anything without knowing what the project actually is. For my models I always...
I use Testors for painting inside lexan interior shells sometimes, but I assume you'll be painting on the outside of a hardbody? My goto airbrush paint for hardbodies is Createx.