hello again!! sorry to make a new thread if i'm not supposed to , but I am scared to post in the other threads reguarding similar problems, because I don't want to dig up an old thread and break any forum rules.
Anyway, I picked up something called "naptha" or "naphtha" at the hardware store, because it says on the container that it can thin enamel.(i only plan to use it for a panel line wash.) I tested it and it mixes well with enamel, and it doesn't affect acrylic paint

.it had no imediate effect on the plastic, but after soaking a piece of sprue in it for a couple hours, the sprue became seriously brittle and shattered

. I don't want to spend all the time building and painting a kit to ruin it at the end

. So, would it be a bad idea to use this for a wash, or is it safe? has anyone ever used the stuff?
P.S. Can you use turpenoid to thin enamel? i have heard about FF's satisfaction with the stuff, and i could get it from michael's art supply.