We always recommend they consult their local paint Professional. Some of our customers have used these products.
BEHR Premium Transparent Waterproofing Sealer 1 Gal. UV Resistant
CWF-UV® is a penetrating wood finish designed to restore the rich, warm appearance of natural wood. It protects against damage caused by moisture and ultraviolet rays.
*Available in Water Base or Oil. Use Natural tone.
Here are some samples of saunas with the UV Clear Coat Stains Applied: