I usually stock up in the early spring. Johnson & Johnson® makes a good product, but the best is Coppertone.®
For the great results, slather it on liberally when you know you're going to be exposed to writers for more than a few minutes. It is especially helpful to use extra just before attending a writers conference.
In the final analysis, Writer's Block is helpful, but the best practice is to lay down a good base so that your body's natural protection can take hold. One way to do this is to wander back into the reference stacks at your local library, then strip to the buff.
Use eye protection.
Horace J. Digby
Winner of the Robert Benchley Society Award for Humor