RE: Klass Kote thinners
Klass Kote is a very nice product and works very well for it's intended use. Your planes look great!! Very well done.
As for the thinner you used on this last plane is Lacquer thinner. There are several grades. Some flash sooner than others. There are retarders that you can get to slow it down even more.
If you have an automotive paint supply near you, you can get polyeurathane reducers that will do the job better than lacquer thinner. They come in three grades such as slow, medium and fast. Slow is the slow setting and is used in warm humid weather. The fast is used in cold weather.
I stopped using epoxy hobby paints years ago and moved to automotive paints known as base coat / clear coat. There is even an additive for a dull finish. And I still use silk and dope finishes too.
Frank