I’ve tried about everything there is and will still get burned. Reapplication doesn’t help, it only allows more roasting. There is no greater feeling than taking a hot shower after a day of being in the sun and you find out what spots you missed.
The best sunscreen is called the house. Staying inside a house is very effective at blocking UV rays. You have to stay away from windows as well. Pull the shades and curtains and turn off all the lights. Stay away from people too, that will help.