Before. Twelve to twenty-four hours ahead.
That’s the whole answer, but the reasoning is worth thirty seconds because it explains a lot of other spray tan rules at the same time.
Why before
A razor is an exfoliant. That’s not a metaphor. Dragging a blade across your skin takes off the top layer along with the hair.
Sunless color lives in exactly that layer. So shaving after your tan doesn’t just remove hair, it removes tan. You’ll see it immediately: lighter, patchy stripes wherever the razor went.
Why not right before
Shaving opens your pores. Spraying into freshly opened pores is how you get tiny dark dots across your legs, because the solution settles into openings that should have closed.
Twelve to twenty-four hours is the window where the hair is gone but your skin has settled. Early enough that pores have closed, late enough that stubble hasn’t returned.
Waxing is different
Wax 24 to 48 hours ahead, not 12.
Waxing is more disruptive than shaving: it pulls from the follicle and leaves skin more reactive. It needs longer to calm down, and any residual wax or oil will block the solution.
Do not wax after a spray tan. Wax strips take color off in sheets, which is exactly as bad as it sounds.
What to do mid-tan
If you need to shave during the week your tan is alive, you can. Just accept that you’ll lighten those areas, and go gently. A fresh, sharp blade does less damage than a dull one dragging. If it has gone far enough that you would rather start clean, take it off properly rather than shaving it away in patches.
Skip the exfoliating scrub beforehand, use a non-oil-based shave product, and moisturize after.
Where this fits
Prep order, start to finish:
- Exfoliate 48 hours before
- Shave 12–24 hours before (or wax 24–48 hours before)
- Exfoliate again the night before
- Finish your shower at least 3 hours before
- Nothing on your skin after that shower
The full version is in How to Prep for a Spray Tan.