I think in earlier posts they said a gallon would thin enough paint for a whole car.

Look for paint thinner. It should say 100% mineral spirits on the can somewhere.

Good luck!

1969 Road Runner, Q5 Seafoam Turquoise Metallic, M6S(pewter, GTX type) interior. Currently has a 440 with 727 transmission. Numbers matching 383 is now being stored. Looking for a 400 or another 383, located near Columbus, to build in its place.