The full review

UnderSense Lash Primer review: my honest take

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*As stated by SeneGence.

UnderSense 3-in-1 Maximizing Lash Primer is the step before mascara. You coat your lashes with it first, then add mascara on top. SeneGence says it boosts volume and length under mascara and conditions lashes. It’s one of those products you don’t need, but it’s the easiest upgrade if your mascara alone feels a bit flat.

One extra swipe before mascara is the cheapest way to make your lashes look like more.

The trade-off is time: it’s an extra step, and you need to let it settle before mascara goes on. It works with any of the LashSense mascaras. It’s also different from LashExtend, which is a lash serum. A primer changes how your mascara looks today; a serum is about how your lashes look over time.

At $28 it costs less than the mascaras, which makes it a small spend for a visible change. If you want your lashes to look longer without switching to a fibre mascara, try this first. If you want length from the mascara alone, FiberExtend is the one-step option.

UnderSense Primer vs LashExtend: primer or serum?

	UnderSense Lash Primer My pick	LashExtend
What it is	Lash primer	Lash serum
When	Under mascara, every time you wear it	As a lash serum, part of your routine
SeneGence says	Boosts volume and length, conditions lashes	An alternative to false lashes and extensions
Price	$28	$60
Pick it if	You want more from your mascara today	You want to work on your natural lashes

Where it fits in your lash routine

1EyeSense Pencildefine2UnderSense Primeryou are here3VolumeIntense Mascaraon top4Fooops! Removerat night

Liner, then primer, then mascara. Coat every lash with primer, give it a moment, then apply VolumeIntense or whichever LashSense mascara you like. Take everything off at night with Fooops! so your lashes aren’t sleeping in product.

What’s in it, in plain words

• Primer base: a coat that goes under mascara so there’s more for the mascara to cling to.
• Volume and length boost: SeneGence says it boosts both when worn under mascara.
• Lash conditioning: SeneGence says it conditions lashes too, which is the third part of the 3-in-1.

My tips

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UnderSense Lash Primer FAQs

What does a lash primer do?

It goes on under mascara. SeneGence says UnderSense boosts volume and length and conditions lashes, so your mascara has more to build on.

Do I need a lash primer?

No, but it’s an easy upgrade if your mascara feels flat. If you’d rather keep your routine short, a fibre mascara like FiberExtend adds length on its own.

Is UnderSense the same as LashExtend?

No. UnderSense is a primer you wear under mascara. LashExtend is a lash serum, which SeneGence positions as an alternative to false lashes and extensions.

Can I use UnderSense with any mascara?

It’s made to go under mascara, and it pairs naturally with the LashSense range: VolumeIntense, the waterproof version and FiberExtend.