Originally posted by Equus
Me? I like to add the artificial fruity smell of Future to water.
Aaah, yes... that Future Flavor. lol
As far as \"what\'s wrong with just water?\", the basic answer is nothing, and lots.
A lot if it actually depends on where you live, and the quality of your tap water. If your water isn\'t too treated, you can probably be just fine. If, though, you have high mineral content, lots of chlorine (or, like El Paso water,
lithium), then you probably don\'t want to use it for painting.
Obviously, the more chemicals in there the more chance that they\'ll react adversely with the acrylic binding in the paints, and you can get some weird stuff happenning. I\'ve seen paint change color as well as coagulate by adding high mineral-content water to it.
So, to be safe, use distilled water. This doesn\'t risk the reactions, but will slightly break up the binding in the paint. Not usually so much that it will be noticeable, until you get to insane amounts of dilution.
Personally, I use a mix of 75% distilled water, 12.5% Future Floor Finish, and 12.5% Extender. I also often use Vallejo Glaze Medium, and I\'m starting to play with the Matte Medium as well.
EDIT: I just realized that my percentages may be confusing, so here\'s the same recipe in proportions.
1 part Future
1 part Extender
6 parts distilled water