What i have found in the junk yard most parts for the 3 cars that spwan in the junk yard at the time are for mainly for the 3 cars!!! So grab the parts then fix them to 100% for maximum profits. I absolutely hate the barn vehicles there over priced and the profit margins are as good as the junk yard finds!!! So dont go wasteing ya money on spraying them only if you wish, Only adding upgrade parts from the store section and making then 3* increases the profits. Ive found that spraying each part dont increase the price of the profits Ok so ive played over 45 hours on the game