A few months ago I had been disappointed with the finish on some of my models. I felt, specifically, that this was due to issues I was having with paint consistency. My Vallejo paints just seemed too thick and using water just wasn't working. As a result I felt my vehicles had very rough looking surfaces and my infantry figures looked very 'heavy'.
I had just been using water to thin my Vallejo acrylics and it just didn't seem to work. The paint either ended up far to runny/wash like or it just didn't seem to coat the model properly. I had a few people offer suggestions and did a bit of hunting about on my own.
The original discussion can be found here.
Eventually I settled on this:
Which I picked up online from SnMstuff for £4.95 (plus postage) and have been using for the last few weeks. I have to say I'm really really happy with this compared to just using water. The paint goes to a good consistency with just a drop added. It thins the paint but doesn't turn it into a wash and still coats well. I'm much happier thinning my paint down now and I feel that I'm seeing much smoother and less bitty finishes.
I did buy a Vallejo branded thinner (Model Colour 524 - Thinner), but it turned out to be some sort of medium and is a milky white substance. I've not tried it. I also bought brush shampoo and restorer, which I've yet to use.
I've not used my airbrush for a while but I'd be willing to try this thinner with a low PSI setting on my compressor (I think that the PSI may have been the reason I was having so many issues previously). I'll let you know if/when I try that out!