How much sunscreen should I apply to my face?

The recommended amount for the face and neck is approximately 1/4 teaspoon (1.25ml) of sunscreen, which equals about a nickel-sized dollop. Most people apply 20–50% of the recommended amount, which significantly reduces the actual SPF protection. For a sunscreen labeled SPF 50, applying half the recommended amount gives roughly SPF 17 real-world protection. Apply to completely dry skin, and wait 15–30 minutes before sun exposure for chemical sunscreens (mineral sunscreens work immediately).

Does sunscreen need to be reapplied indoors?

If you are near windows, yes — UVA rays (which cause aging and skin cancer) penetrate glass. UVB rays (which cause burning) are blocked by standard glass. For desk work near a window, reapply SPF once in the morning. For outdoor activities, reapply every 2 hours or immediately after swimming or sweating. A setting spray SPF or powder SPF makes reapplication over makeup practical.

What is the difference between PA rating and SPF?

SPF measures UVB protection only — the rays that cause sunburn. PA rating (used in Asian sunscreens) measures UVA protection: PA+ = some UVA protection, PA+++ = high, PA++++ = maximum. Western sunscreens use the term "broad spectrum" to indicate UVA protection, but this is a binary pass/fail — it does not quantify the degree of UVA protection. PA++++ Japanese/Korean sunscreens often provide superior UVA protection compared to most Western broad-spectrum formulas. For anti-aging, UVA protection matters more than the SPF number.

sunscreen · Review

Supergoop! Unseen Sunscreen Review: The Makeup Primer SPF

Supergoop! Unseen goes on like a silicone primer, disappears on every skin tone, and has SPF 40. Here's the 6-month honest review.

Our verdict

Supergoop! Unseen Sunscreen SPF 40

$38

9.1

out of 10

Check price →

Last updated April 12, 2026 · 5 min read · First published Apr 2026

Heads up: this post has affiliate links. We may earn a small commission if you buy something, at no extra cost to you. We only link to stuff we'd actually tell a friend about. Prices shown are approximate and change often; check the retailer for current pricing.

What we like

✓ Goes on clear — no white cast on any skin tone
✓ Works as makeup primer (seriously, not just marketing)
✓ Fragrance-free, oil-free
✓ No stinging eyes reflex
✓ Broad-spectrum SPF 40

What bugs us

✗ $38 for 1.7 oz is premium
✗ Silicone finish isn't for everyone
✗ Contains dimethicone — some find it drying over time
✗ Not water-resistant

The short answer

Supergoop! Unseen is the clearest-wearing daily chemical sunscreen on the market. The silicone-based formula doubles as a smoothing primer under makeup. $38 feels steep but the “I actually wear it” factor makes it worth it.

Supergoop! Unseen is genuinely what it says — invisible sunscreen. Here’s the no-BS review.

What makes it work

The short answer

Supergoop! Unseen uses avobenzone + homosalate + octisalate chemical filters in a clear gel-cream base. The dimethicone content makes it feel identical to a silicone makeup primer, which is why it became the go-to pre-makeup SPF.

Active ingredients:

Avobenzone 3%
Homosalate 8%
Octisalate 5%
Octocrylene 7%

Base:

Dimethicone (silicone)
Polysilicone-11
Butyloctyl salicylate

The silicone base is the whole trick. It’s why it blurs pores, fills fine lines visually, and sets smooth under foundation.

Real-world performance

I’ve used Unseen daily for 6 months. Here’s what holds up:

Under makeup: actually works as primer. Foundation applies more smoothly, lasts longer.

Bare skin: completely invisible, no cast, no tint, no shine.

Tretinoin compatibility: fine, no sting.

Reapplication: tricky — can’t easily reapply over makeup. Use a powder SPF for midday.

All-day wear: 6-8 hours. After that, protection drops meaningfully.

Who should buy Unseen

Perfect for:

Makeup wearers (it’s the best primer-SPF hybrid on the market)
Darker skin tones (zero cast concern)
Oily skin (silicone finish controls shine)
People who hate mineral textures

Skip if:

You’re silicone-sensitive
You need water-resistance (beach/pool)
You want to layer lots of skincare underneath (silicone can cause pilling)
You’re on a tight budget

Comparison to alternatives

vs EltaMD UV Clear ($41): EltaMD is better for sensitive/acne skin. Unseen wins for makeup-wearing and deeper skin tones.

vs Beauty of Joseon ($18): BOJ is way cheaper but doesn’t prime. Unseen is for when you want the primer-SPF combo.

vs Biore Aqua Rich ($16): similar watery-texture philosophy, much cheaper, less makeup-friendly.

The price question

$38 for 1.7 oz is $22/ounce. Compare:

Drugstore sunscreen: $3-5/oz
Mid-tier (EltaMD, Supergoop): $20-24/oz
Luxury (SkinCeuticals): $35+/oz

You’re in the middle-premium tier. Justified by the primer functionality — otherwise we’d call it overpriced.

Check current price on Amazon →

The verdict

Score: 9.1/10. Best makeup primer that happens to be SPF 40. Worth the price if you wear makeup daily and hate feeling SPF on your face.

Ready to buy?

Grab the Unseen Sunscreen SPF 40 on Amazon

Check current price →

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