A, B, or C?. Given your assessment of the depth of the damage (A, B, or C), apply your paint, including primer, base color and clear coat as appropriate, to the test card to understand how many coats are needed to achieve the finish you want.
What is the test card for? The test card is for you to practice with your paint. Getting a feel for the opacity and film thickness will greatly improve your handling of the paint. The pros do this. Learn how the paint acts, how much paint to use on each type of applicator, and how each coating looks. This is part of the art of the repair. The color you purchased should match your car’s paint color.
Test the clear coat for dripping/running. Determine if your surface is horizontal, vertical, or sloping. Some angles can promote dripping or running in the clear coat. Practice the clear coat on the test card and hold the test card right up next to the car (but not touching) near the repair area to determine if the clear coat will run. If it does, practice again with a less heavy layer so that the clear coat does not run. You are aiming for a layer that is somewhere up to 50% heavier than that for base color but not so much that it runs.
What part of the card should I paint on? The test card has multiple test squares that you can use, and each area on the test card is at the perimeter of the card, so we recommend that you apply your test right up to the edge of the card. That way, when it is dry, you can hold it next to your car and have a seamless edge between the test color and your car color.
Which applicator do I use? In our testing, the toothpick and the micro-dabbers are best used for small chips, not scratches or large chips. A small chip is generally just a millimeter or two in diameter, about the size of the head of the micro-dabbers that we’ve provided. The micro-dabber is great for placing a drop of paint onto the chip. For scratches and larger chips, you will need to apply paint to a larger area, and this involves dragging the applicator across the blemish. The small brushes we’ve provided are perfect for this. A gentle touch with a brush will leave a smoother finish. The dabbers are NOT good for scratches because they don’t hold enough paint, and they drag the little paint that they hold and create an uneven surface. The brushes are better suited to smoothing the paint out over the length of a scratch or large chip.
Holding the applicators. People have various ways of holding a brush or applicator. Do what feels most comfortable and steady for you. Most people will hold the brush/applicator like a razor. The advantage is your hand does not cast a shadow over your work area.
Loading the applicator with paint. Too much paint on the applicator tip will diminish your control over how much paint you lay down. Try to have enough paint that the applicator tip/bristles appear saturated but not so much paint that a ball of paint is ready to drop off. Choose the applicator that appears most suited to the job; toothpick, dabber, or ultrabrush. There are two different size dabbers, 1mm and 2mm included, 4 brushes, and toothpicks for the smallest of chips.