Rule
2 hours dry
The default when you're outside and not swimming or sweating hard.
Tool / Sun care
SPF reapplication timing without the guesswork.
Pick when you put sunscreen on, how long you'll be outside, and whether the day includes sweat or water. This planner maps the next layer and the rest of the schedule in plain time, not vague reminders.
Water
40 or 80 minutes
Use the timing printed on your sunscreen label.
Reset
After towel drying
Treat drying off as the cue to put another full layer on.
Built around the sunscreen directions people actually use in real life: every 2 hours outdoors, sooner when swimming or sweating, and again after towel drying.
Interactive planner
Map your sunscreen schedule
Next reminder
11:00 AM
Dry-skin timing: reapply every 2 hours.
Use the standard 2-hour sunscreen rule when you're outside and not dealing with sweat or water.
Planning window ends at 1:00 PM.
Schedule
Next layer
11:00 AM
This is the next full layer to aim for if the sunscreen is still intact.
Start from the time you applied sunscreen
Reapply 2
1:00 PM
Keep using the same interval while you stay outside.
This is a planning tool, not a diagnosis. Follow the directions on your specific sunscreen label and use extra shade, hats, or clothing when you need them.
02 / Examples
Real-life timing
Not every missed layer happens on a beach. Lunch patios, stroller walks, weekend errands, and hot outdoor workouts are where timing starts to blur.
Walk + errands
Applied at 9:00 AM
If you're out through lunch and your skin stays dry, your first reapply reminder is 11:00 AM.
Workout outside
Applied at 6:30 AM
For sweat-heavy runs or court time, switch from the 2-hour rule to the 40- or 80-minute water-resistant window printed on the label.
Pool or beach
Applied at 12:15 PM
Your next layer is driven by the bottle's 40- or 80-minute timing, and you should reapply after getting out and towel drying.
03 / FAQ
Sunscreen timing questions
This page is built to answer the sunscreen timing searches that usually happen right before someone heads outside.
04 / App
Keep sunscreen in the same routine as everything else.
Glass helps you keep reminders, routines, skin scans, and day-to-day consistency in one calm loop instead of hoping you remember the timing on your own.
Download nowRoutine support · Scan history · Progress tracking
Morning
Put SPF next to the rest of your routine
Glass already tracks the parts of skincare people forget first: consistency, not just intent.
Later
See what repeated protection actually supports
The point is not one perfect sunscreen day. It's the calmer routine that keeps adding up week after week.