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1 Using expired sunscreen isn't as noticeable as drinking expired milk, but it can drastically reduce the sun protection you're getting. 2  It's best to discard expired bottles once they have reached the expiration date. 3  The downsides of using expired sunscreen are too high.
About DEET and Sunscreen. The debate on the application of sunscreen with DEET is an old one. Using DEET insect repellent with sunscreen decreases the effectiveness of the sunblock by about 30-40%. So if using both at the same time, be prepared to re-apply sunscreen more often than if using sunscreen alone. There are several commercial products that combine DEET and sunscreen into one cream or lotion.