How can I seal a table to protect it from the elements?

Martha
by Martha

I have a 60 year old picnic table handmade which was damaged in a hail storm. I sanded all the dents out it looks like it was made of two by fours... I want to keep the retro look of the table and want to seal it from the weather without color. Any suggestions??? They say polyurethane won't work in the sun and I also tried a natural stain but came too dark.....

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