To cover pale tan lines you need a muti-step approach. This technique is very similar to the one used for clients with Vitiligo.

First “tan” all pale skin areas to help them more closely match darker surrounding skin. To do this, it is usually going to be easiest to apply solution to the pale skin by hand application (not spray gun).

You will need to dab or paint solution onto all pale areas with a cosmetic sponge or paint brush, blending at edges. You will usually need to do one to two, or so,  coats this way. Fill pale areas so they are a similar darkness as surrounding tanned skin. The color tone will not be identical. You are simply trying to apply product to match depth of the surrounding skin.

Keep in mind that a product with a very dark bronzer, may look darker then the final tan, because of the bronzer colorant which will wash away in the first shower.

After all pale areas are filled in (with similar darkness as surrounding tanned skin) let them dry.

Blow dry with a blow dryer or spray gun air blowing from the air hose.

After skin is dry, do a light single coat of spray tanning solution misting over the entire body, including all pale areas, to even out skin tone head to toe, and help it match the areas you have just blended.

Try to see the client again in 24 hours, after they have showered, to check work, and do any touch-up that may be needed. Results will not be perfect. But they can look very nice.

The pale areas will often fade differently, and may look rusty or speckled after a few days. This is normal because of the lack of pigmentation in the skin.

Client may also choose to use a cosmetic bronzer or makeup product on top of the spray tan, to help further blend, and even out skin contrasts.