Even if you want to tutone your chopped tourpak you should order it, if possible, in the base color from HD. This will save several dollars in prep and paint cost. The colors are very expensive, One pint (out the back door) cost me $70.00 for my 15 and that is not inc thinner etc. So buy it at least one color already painted, scuff the complete tourpak, tape off the section you want to remain that color and spray the new or smaller area color, then peel off the paper from the oe painted section and clear the complete pak, you will already have scuffed it before tapping it off so when painter sprays his clear he will just do the complete pak. This is basically the way all shops blend a door or fender for color match on a car. Works great. You will be sanding and buffing the finish anyway so it will match the finish of the rest of bike and you are assured of the larger section having a good color match. Most of the time the lower section is the only one tutoned so the lid would require no work and a pint (or less) of your second color is the only paint (not material) you would have to buy.