I'm about to paint my restomod land rover, and I've been looking for a solid charcoal gray basecoat (using SPI epoxy, high build, and clears) to spray. Earlier this week my buddy found out about my project and offered me two gallons of free 2-part charcoal gray fighter jet gray aircraft paint. It's overage and they are just going to toss it. Does anyone know the primary differences between high quality aircraft and auto paint? Any reason why I couldn't or should't shoot my resto with it? Thanks!