One more thing I think could help is a long-sleeved shirt or extremely light wind-breaker jacket, even on a hot day. You might sweat a bit more, but a cool shower will take care of that and be easier on you than medical attention. I have even gone so far as to wrap a towel around an exposed arm on a long cruising day when the suns rays were not being caught by the canvas top.
Someone once said that an ounce of prevention is worth a pound of cure; a very applicable concept when considering the relentless rays of the sun.
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