So, here is the rumor I heard. And this is the way I use the Tamiya panel line wash. I did not believe it until I tried it. If you are using water based acrylics... put the panel liner right on the acrylic paint *before* putting a varnish on. Let the acrylic paint cure for 24 hours. I have not tried this with AK enamels, so try it on a paint mule. I was surprised by how well it worked with the Tamiya enamel panel liner. As far as removing the extra wash, I say 30 minutes unless you live in Ireland or something