A few more masking tips.

On the attached illustration you will see in Number 1 how two colors are painted next to each other (butted). We want to avoid this if at all possible as it will leave two paint ridges after the masking tape is removed. The big problem is when you do this it can leave a very ragged (uneven) edge after you knock back the ridges. The other problem is, both colors have to be aligned perfectly or you will get unwanted overlap or a microscopic gap between the two colors allowing the base color underneath to show. This can all be fixed, but it's very time consuming.

Number 2 shows the preferred method of masking by having the one color overlap the other by a very small amount. This will give us the cleanest line with only one paint ridge to knock down.

In Number 3 we see two arrows marked Correct and Wrong. To keep paint buildup at the edge of masking tape to a minimum, we want to shoot our paint at a right angle (90 degrees) versus shooting into the tape at an angle. This can make a major difference in the amount of paint buildup at the edge of the tape.

You can see in the attached picture a very small overlap of the silver pinstripe onto the adjoining purple paint on both sides. I prefer to shoot a dark color over the lighter color, but you can see it works fine both ways. Now this picture was taken before the clear was shot. After the clear is applied and cut back (leveled), you will never see or feel the slight overlap.