here is what I use for thinning enamel
mix 2 parts paint to 1 part lacquer
use the cheap lacquer thinner from hardware store. Do not use automotive grade thinner it is to "HOT" and will cause the plastic to melt.
this works for me hope it helps you.
name is Bill, Just getting back into modeling haven't done much in abt 20 yrs. Love all the advice that is found on this site as I am always trying new things with each kit I build.
Love seeing what all of you have built I am no match to that, still fun to look and get ideas.