I hate to say this but that's not exactly true about Grime being the definitive base color. Its merely speculation that has been accepted by the community. The only known color that was used is Concrete because when asked of one of the people that actually worked on the ship, the only color he remembers using was Concrete... but he basically stated that they would grab a color off the shelf and use it without keeping track of the actual color name. They really didn't keep any notes while making these models. None of them even thought the movie was going to be a hit. Matter of fact, they thought it was going to bomb and many people in the production would quit and be replaced with new people (thus resulting in the various techniques found that were used on the ship... some places were sanded... some were scraped away.. .etc). When the subject of using Floquil Grime came up, it appeared as if it were a pretty good match... however, that was a match to the current state of the ship, not while it was in production and like I said before, age and environment tend to "yellow" the paint. So its quite possible that NOW Floquil Grime would be a perfect match for the color of the ship we see today... however, during production, it's quite possible that the ship was painted in nothing but gray tones (as the only definitive paint we know was used was Floquil Concrete). So... in any event, I personally would probably use the custom mixed paints that Trackpads came out with, seeing as they are the only known paints exclusively designed for the Falcon itself.