I just use the Vallejo thinner--it's a big bottle and goes a long way. H2O has too many minerals and chemicals (at least here in Paulding County). I've found small plastic "ramakins" work great for mixing and even storing a custom color/wash:Good to have you following along and looking forward to seeing the builds. Definitely some talented artisans in here. What do you thin the Vallejo acrylics with? I spray a variety of brands without issue but have had very limited success spraying Vallejo thinned with h2o. No problems with a brush though.