By Tom Hargreaves|Men's Grooming Editor|6 min read
"I can't seem to get hair fibres to work." You see that sentence constantly on hair loss forums, usually followed by a bottle going in the bin and a fairly firm opinion about the whole category.
Most of the time the fibres were fine. One step in the routine was off, and one step is enough to ruin the lot. Here are the six that come up again and again.
the six mistakes, roughly in order of damage
1. your hair isn't properly dry
Fibres need bone dry hair. Not towel dried, not nearly there, not that bit at the back you couldn't be bothered with.
Damp hair makes them clump into dark specks and slide down the strand to the scalp, where they look like dirt rather than hair. If you're in a rush, thirty seconds of hairdryer on the roots is the difference between a good result and a wasted morning.
2. you're loading it all into one spot
The instinct is to aim the bottle at the thinnest patch and shake until it's covered. That gives you a mound of fibres sitting in a hole, which is precisely what you were trying to hide.
Work over a wider area than the thin bit, in short passes, and build. Thin coverage over a big area disappears. Thick coverage over a small area announces itself.
3. you skipped the locking spray
The most common one by miles. Fibres look their best about four seconds after you apply them, standing still, in your own bathroom. The mirror isn't the test. Hour six is the test, when you've been on the tube, worn a hat, run a hand through your hair twice.
Locking spray is what gets you from four seconds to all day. There's a full guide to using it properly on the blog, and a separate piece on what happens in the rain if that's your worry.
4. your shade is off
If the coverage looks like a colour instead of like shadow, your shade is wrong. Match your roots rather than your lengths, and when you're stuck between two, take the darker one. There's a full article on shade matching elsewhere on this blog, including the awkward grey and blonde cases.
5. you're rubbing instead of patting
Rubbing drags fibres sideways, pulls them off the strands they've just attached to, and leaves gaps exactly where you were trying to add density.
Pat instead. Fingertips, light, straight down onto the scalp. It settles the fibres in and spreads them without wrecking the arrangement.
6. you're spraying from too close
A locking spray held ten centimetres away hits like a pressure washer and blows the fibres out of position. You end up with wet patches and drips down your forehead, and you blame the fibres.
Arm's length. Thirty centimetres minimum, light mist, two or three passes rather than one soaking.
if they made your scalp itch
Itching is a real complaint, and it's worth knowing what usually causes it. Heavier keratin fibres (the industry default, derived from wool and other animal proteins) sit differently on the scalp than cotton, and wool is not everyone's friend. Cotton fibres are lighter and matte, and generally kinder for people who react to the standard stuff.
The other culprit is leaving them in for days. Fibres are a same-day product. Wash them out at night and the buildup problem, which is what most itching actually is, goes away.
If your scalp is genuinely sore, flaky or inflamed, that isn't a fibre problem. Stop using them and see a GP or a pharmacist.
when it isn't the fibres at all
Fibres need existing hair to cling to. That's the whole mechanism, a static charge holding tiny strands onto the ones you've still got.
So they're excellent on diffuse thinning, a widening parting, a see-through crown, receding temples with some fluff still there. On skin that's completely smooth and bare, there's nothing to hold them and no amount of technique changes that. Better to know before you order.
And a plain one: fibres are cosmetic. They cover what's thinning today, they wash out tonight, and they do nothing to your follicles either way. If your hair loss is sudden, patchy, or moving faster than it was six months ago, book a GP appointment. Concealer doesn't answer that question.
what to do now
If you've already got a bottle sitting in the cupboard from a failed attempt, run the list before you replace anything. Dry hair, wider area, lighter passes, pat don't rub, spray at arm's length. Give it three mornings, because the first go with any change of technique is always the worst one.
If the shade was the problem, that's the one thing you can't fix with technique. Our fibres are cotton rather than keratin, so they're matte and light, and they cling instead of clumping. Pair them with the locking spray and you've removed two of the six mistakes on this list before you start.
FAQs
Do hair fibres look fake? They can, and it's nearly always shade or quantity. Too light a colour reads as powder, too much product reads as a painted parting. Matched properly and used sparingly, they read as shadow at the root, which is what natural density actually looks like.
Why do my hair fibres fall out during the day? No locking spray, in almost every case.
Can I use hair fibres every day? Yes. Apply in the morning, wash out at night, repeat. Daily use is normal and it's a better routine than trying to stretch one application over two days, which is where itching and buildup start.
Are hair fibres itchy? Some are, for some people. Keratin fibres are heavier and wool-derived, and that's the usual trigger. Cotton fibres are lighter and tend to sit better on sensitive scalps.
Do hair fibres work on a completely bald spot? Not well. They need existing hairs to bind to, so smooth bare skin is the one situation where they can't do much. Thinning areas with hair still in them are exactly what they're built for.