"Never Felt The Need To Reapply"
I can attest to how good the sunblock is. I wore it yesterday when I was installing a new traveler track and car on the IC37 up at New England Boatworks in the blazing sun. I normally get a sunburn when I walk by an exposed lightbulb so I use a ton of sunblock and have to reapply often. I put the Harken Derm on before I left my office and never felt the need to reapply. When I got home last night I didn’t feel burnt at all. I’m going to be using this going forward.