Thanks, the reason I ask is that some of the water based paints border on being a solvent based paint. The simple fact it dries a lot or any quicker than water leads me to believe there are other chemicals at work (yes, I know that's obvious else you wouldn't need a special reducer
).
Check the MSDS of all water based/waterbourne paints carefully as the term 'water based' can be misleading. You don't want to be spraying something in your house or art studio that is using a solvent, alcohol or amonia based product in a reducer. If you need to mix home made concoctions to make your paint work just be careful as the vapours produced can be quite toxic and even flamable, or just buy solvent based paints and take the normal precautions, at least you won't be tempted to be as lax on your safety
The bottom line is all water based paints are not created equal, just be aware of that and take the right precautions