5 Reasons Self-Tanner Never Fixes Your Tan Lines

You already bought the mousse, the mitt and the drying spray. Here is why the stripes are still there in September.

Self-tanner is the most common answer to tan lines in the US. It is also the one women complain about most.

It makes sense on paper. The pale stripes are already there, so you cover them. Blend the edges, even out the tone, done. Except almost nobody gets that result, and most women blame themselves for it.

It is not your technique. Here are five reasons the bottle was never going to solve this, and the one thing that changes the outcome.

Every day you spend outside, the tanned skin around the strap gets a little darker. The skin under the strap does not. The gap you are trying to hide keeps widening while you are busy hiding it.

So the amount of product you need grows through the season. By August you are not touching up anymore, you are repainting.

Self-tanner develops into one fixed shade. A real tan does not sit still. It deepens after a beach day, fades after a week indoors, and looks different in the evening than at noon.

You are asked to match a colour that changes weekly, using a product that only makes one colour. That is why the patch reads as slightly off even when the application was clean.

A tan line is a border. Borders are the hardest thing to blend, because you are working on the one spot where two different skin tones meet.

Add the places you cannot reach. The back of your shoulders, the line across your upper back, the underside of your arm. Those are the strap marks that show most in a dress, and they are the ones you have to do blind or ask someone else to do.

Self-tanner sits in the top layer of skin and leaves with it. Chlorine, salt water, sunscreen and shaving all pull it off faster.

Which means this is not one decision. It is a chore you repeat every three or four days from May to September, and a cost that repeats with it. Most women stop somewhere in July, not because it failed once, but because they are tired of it.

Every one of the four points above exists because the sun never reached that patch of skin. The bikini blocked it. Everything after that is repair work.

Which is the part most women never question, because a swimsuit is supposed to be solid. It does not have to be. Tan-through fabric is woven with thousands of tiny openings that let a share of the light pass through to the skin underneath.

You still tan lighter under the fabric than next to it. The difference is that the border stops being a hard edge and becomes a much softer transition. Nothing to blend, because there is far less to hide.