DuPont ChromaSystem

I have never used it but it looks like a good epoxy primer that can also be used as a sealer, similar to PPG's DPLF (formerly DP). Here's the tech sheet. Note the relatively short time window (24 hrs). The PPG DPLF is a high end epoxy and I would expect the DuPont product to be of similar high quality.

The tech sheet for your paint product will specify the recommended clean-up solvent. It is sometimes lacquer thinner, sometimes the same reducer you use in the topcoat and sometimes a dedicated product. A universal type gun cleaning solvent can be a little cheaper than using a high grade reducer. I used to use DuPont's 3924S, Gun and Equipment Cleaner but the last time I tried to buy some it was not available. I don't think DuPont markets the stuff anymore. I currently use a universal product called "The Naked Gun" by Klean-Strip. It works well and, as I recall, is cheaper than topcoat reducer. It is a very slow evaporating solvent intended for gun cleaning.

Rod

If you are not used to using a spray gun, by all means do some practice painting on a vertical piece of sheet metal. Start out with some cheap paint but before you finally tackle an important piece, do a trial sprayout with the actual paint you are going to use. I know you don't want to waste the expensive stuff but it is easy to mix up only a small amount and try it out just like you did with the cheap paint. It is well worth the small amount of good paint "wasted" to gain some confidence in the actual material. I do a test sprayout whenever I use a paint material that I have not used before and find it well worth the little extra effort. I'll be doing just that fairly soon with a BC/CC job on my wife's car since I have never sprayed a basecoat before. I'll spray 3 coats on 2 or 3 square feet of a vertical panel just to make sure I will not be unpleasantly surprised when I do the actual part. This will also verify the flash time noted in the tech sheet and give you an idea if you have to speed up or slow down your normal travel speed relative to orange peel and runs. I find it hard to move between my HVLP gravity spot gun and my full size pressure-fed conventional gun because the guns and the required technique is quite different.

If I get a chance this weekend I'll post a detailed description of my thoughts about understanding and getting the correct gun air pressure; at least how I normally do it. It's an important part of using a spray gun successfully.

Here's a brief usage and troubleshooting guide for most sprayguns. It is published by DeVilbiss but can also be applied generically to most guns, I think.

Rod