Thanks guys.
I don\'t want to compare GW with any other brand. I use several brands and for several reasons I have no plans to stop using GW. There are countless other threads that debate the GW/Vallejo question. Yes, Vallejo paints are good.
These aren\'t paints that are in any danger of drying up. I\'m looking for a method of upkeep, to add a few drops of liquid every now and then.
Specifically, I\'d like to know about the chemistry of the paint. Is there any drawback to using water rather than thinner? What is acrylic thinner, actually? Is there a difference in quality from brand to brand?