Please read our detailed instructions for an in-depth explanation of how to get a smooth finish.
The first thing to keep in mind is that you are applying paint with an applicator, as opposed to spraying. So the paint won’t go on as smooth as a spray coat, but we can address the smoothness later, when it dries. As you apply the paint to your chip or scratch, try to keep it as even as possible with gentle strokes of the applicator.
The second thing to keep in mind is that the “invisible-ness” of your repair is a function of two things: 1) color match; and 2) creating a level final surface so that reflected light does not get distorted by a chip or scratch that is lower or higher than the surrounding paint. Often, customers will put one coat of touch up paint in a deep scratch, and it will match the surrounding paint color, but it won’t fill in the scratch. So the scratch or chip is catching the reflected light and remains noticeable. You will need to either use primer as your first coat to fill in a deep blemish, or use multiple coats of paint to fill in, or in extreme cases, wet sand the scratch to smooth it out. However, note that when you wet sand, your repair area will get larger, and in many cases wet sanding is only done before aerosol spray touch ups.
Remember that paint is very thin, when properly applied it is only 5-10 microns thick, yet scratches are almost always deeper. So paint itself is often not enough to fill in a scratch.