Although only a few people specifically mentioned using DAP Ultra Clear All Purpose Waterproof Sealant on their gutters, over 1,100 reviewers gave the super flexible product a five-star rating.

BEST FOR WATERPROOFING: Thompson’s WaterSeal Clear Wood Sealer BEST WITH UV PROTECTION: Defy Composite Deck Sealer BEST LONGEVITY: Olympic Maximum Oil-Based Clear Waterproofing Sealant ...

We've tested and reviewed products since 1936. Read CR's review of the Thompson's WaterSeal Waterproofer Plus Clear Wood Protector wood stain to find out if it's worth it.

A clear sealer will usually need to be applied every year; a semi-transparent one, every two to three years. “How often you should reapply depends on your climate,” says de Paz.