Best Wood Sealer For Outdoor Furniture. Danish oils are a polymerized version of linseed or tung oil, and it’s one of the best sealers for outdoor wood furniture. The benefits of using danish oil are many:

It’s superior in protecting wood from chemical damage and heat, while improving resistance against stains and scratches. The benefits of using danish oil are many: Ad thompson's® waterseal® is the simple choice for sealing your exterior surfaces.