To seal the ends of logs, you can use:
Wax: Applying melted wax to the ends helps prevent moisture loss and cracking.
End Grain Sealer: Specifically designed sealers for end grain, creating a protective barrier.
Wood Preservative: Products with preservatives guard against decay and insect damage.
Polyurethane Sealant: Provides a durable, weather-resistant seal for log ends.