Ooh, I like that ‘black’ I’ve seen that on old canal boats (I’m a long way from the sea). Just the job.
Vallejo paints are tricky to spray. Their main market is brush painting figure modellers. I love their game colour range - so vivid! The Modelcolor range is also good on a hairy stick, though the colours are inconsistent between batches and often are nothing like what it says on the bottle. Not really a problem for us but aircraft guys hate it.
Vallejo do a pre-mix range. Modelcolour Air but I found it still needed a bit of thinner.
Airbrushing paint needs to be as thin as the inks you are used to. That means you need a paint with enough pigment content to stand the dilution without becoming ridiculously translucent.
Several thin coats are the usual thing. Don’t expect the first coat to cover well - if you do, you’ll put too much on and get runs.
If you spray it on THIN, especially in your summer climate, by the time you’ve finished the first coat, stood up and had a stretch, it should be almost ready for a second thin coat. Honestly, it took me years to get airbrushing right and the mistake I made over and over again was under-thinning.
Thick paint dries on the tip causing stoppages. It dries in the brush’s cavities making cleaning very difficult. It dries in the air before reaching the model giving a sandpaper finish. It dries on the model too fast for it to level out making orange peel.
Do an experiment with any paint you want to airbrush. Thin it to water consistency and then thin it again. Try it. Thin it again. Find out how thin you can go before it splits. Then use it just this side of its breaking point.
You also need very finely ground pigment so the particles will not clog - that’s why artists paints are no good.
You also need a strong binder that will hold everything together when very diluted. That’s Vallejo’s weak spot. Their paints are kinda rubbery for days after drying, while they cure fully. Even after curing Vallejo is easy to scratch. I believe the binder is chemically close to latex(?). If it’s over thinned it ‘splits’, falls apart chemically and turns to porridge.
Vallejo bottles are hard to stir. You can only shake them and if you don’t get the binder, solvent and pigments properly distributed, you are doomed. Nothing will be predictable. I put the bottles in my pocket in the morning and let a five mile dog walk and the body heat put them into prime condition.
I no longer try to spray Vallejo but use them for all my brush painting. I spray Tamiya.
Tamiya paints are awful on a paintbrush but spray like fairy dust. They use a water/alcohol thinner and so can be thinned so they are wetter than water alone. They dry and cure fast to a tough hard finish. Gunze Mr Color paints are very similar but better still. Unfortunately v pricey here and hard to find sometimes.
Dammit! I knew that if I started talking paint I’d ramble on like the pub bore. I’ll stop now and get me coat.