A pea-sized amount of foundation cannot deliver meaningful broad-spectrum protection.
The 2 mg/cm² test dose is far more product than anyone applies as makeup.
Questions we get a lot
Can I skip sunscreen if my primer has SPF?
No. SPF doesn't simply stack, and you apply far too little primer to reach its labeled protection. Use a dedicated broad-spectrum sunscreen as its own step, and treat any SPF in primer or makeup as a small bonus on top.
What order do sunscreen and makeup go in?
Apply skincare first, then sunscreen as the final skincare step, and let it dry; apply makeup on top. With chemical sunscreens, let them absorb for a few minutes before makeup. Sunscreen goes under makeup — you only reapply over makeup later, using powder or spray.
Does the SPF in my makeup provide enough protection?
Usually not. To reach a foundation's labeled SPF you'd need to apply far more than anyone does — roughly 5–10 times a normal makeup amount. Treat SPF in makeup as a bonus, not a substitute: apply a dedicated broad-spectrum sunscreen underneath.
r/30PlusSkinCare: 'Can I skip sunscreen if my primer has SPF 30?'
