Thanks for the info guys! I have a few things to try. I'm also using a airbrush for the really hard to get to spots, you have to put on a ton of coats but its small enough to do the job and relatively easy to use. I am using a base / cc, I haven't put on the clear yet as the yellow was significantly brighter than the butterscotch that I don't think adding a clear would darken it, rather make it brighter. We are trying a few things to darken it up. Luckily its only the lower frame rails inside the engine bay, I couldn't imagine if I had to paint a fender or something major