Polishing a test spot: which polish and pad combination works?

A test spot is a small area where you try a polish and pad before polishing the whole car. It shows you early on whether scratches are reduced enough and the paint finishes clearly. This saves unnecessary polishing stages and helps you find the right combination.

You do not need a complicated test setup. A well-prepared area, a clean pad and good lighting are enough to get started. What matters is assessing the result honestly after wiping off the polish.

Where should you make your test spot?

On the washed and dry car, choose a reasonably flat area with representative defects, such as part of the bonnet. Around 40 × 40 cm is a practical starting point for a typical polisher. The area should be large enough to move the machine evenly, but small enough to inspect easily.

A single particularly deep scratch is not a good benchmark for the whole vehicle. Choose an area representative of the rest of the paint. Repainted panels may react differently and need their own test.

Which polish and pad combination should you try first?

• Fine polishing marks or light haze: Perfect Finish with a Perfect Finish Pad. On very sensitive dark paint, use the Ultra Soft Pad for an especially fine finish.
• Light to moderate wash-induced scratches: Black-One with a Medium One-Step Pad.
• More pronounced defects that a milder combination cannot sufficiently improve: Test a suitable cutting combination, provided the paint can safely tolerate the correction. Then check whether finishing is needed.

If you are unsure how the product grades compare, see Cutting compound or finishing polish: which do you need?. Our Polishing System Test Kit includes five different pads and three polish samples of at least 45 ml each. Choose the correct pad size for your machine. The kit is intended for trying combinations; a whole car will usually require additional spare pads.

How to polish and inspect the test area

1. Inspect the starting condition. Illuminate the dry area from several angles. Identify the defects you want to improve. Keep the lighting similar afterwards for a fair comparison.
2. Start with fresh equipment. Centre a clean pad suited to the polish on the backing plate. Cutting compound residue must not contaminate the finishing stage.
3. Polish for a manageable working cycle. First spread the polish at a low setting. Then move the machine evenly over the area, keeping the pad as flat as possible. The working setting depends on the machine and polish. Do not keep polishing until the pad runs dry over the paint.
4. Wipe off gently. Use a clean, soft microfibre towel and light pressure. If wipe-off becomes difficult, check the product amount, pad and temperature.
5. Inspect without an oil film hiding defects. Remove polishing oils from compatible paint using Ultra Degreaser. Allow the area to dry and inspect it again under light. For the full process, see Degreasing paint before applying protection.

What should you do after the test spot?

The paint is clear and the unwanted marks are sufficiently reduced

You have found your combination. You do not need to add coarse, medium and fine stages. Use the same process on comparable areas and continue checking the result as you work.

Too many scratches are still visible

First check that the pad is clean and you are using the machine correctly. Only then test a stronger combination. For a fair comparison, use a neighbouring area with similar scratches: the area you have already polished has already received one working cycle.

The scratches are improved, but fine haze remains

Test a finishing stage with Perfect Finish and a suitable finishing pad. The Ultra Soft Pad is particularly useful on sensitive black paint. We explain the two-stage process in One-step or two-step polishing.

Only isolated deep scratches remain

Do not chase them at the expense of the remaining paint. A noticeably better finish with a scratch still present can be the more sensible result. See Scratches in car paint: possibilities and limits.

Make a quick note of the polish, pad and machine setting on your phone. You will not have to find the right combination again after a break.

Frequently asked questions