Sealing logs before they are sent to the sawmill is generally not necessary or recommended. Logs are typically processed into lumber relatively quickly after being harvested, and sealing them beforehand can interfere with the sawing process and potentially contaminate the sawmill equipment.
However, if there will be a significant delay between log harvesting and milling, such as when logs need to be stored for an extended period, you may consider sealing the log ends to minimize moisture loss and reduce the risk of end checking. In such cases, follow these guidelines:
Timing: Seal the log ends as soon as possible after cutting to minimize moisture loss and end checking.
Clean and prepare the logs: Remove any loose bark, dirt, or debris from the log ends. Clean surfaces allow for better adhesion of the sealant.
Choose a sealant: Select a sealant that is suitable for log ends and offers protection against moisture loss. Wax emulsion, latex paint, or specialized log end sealers can be used.
Apply the sealant: Use a brush, roller, or sprayer to apply a generous coat of the chosen sealant to the log ends. Ensure complete coverage, including the exposed end grain.
Allow drying: Allow the sealant to dry thoroughly according to the manufacturer's instructions. Drying times may vary based on the sealant used.
Remember that sealing log ends is not a foolproof solution and may not completely eliminate end checking. Proper storage and handling of the logs, along with appropriate sawing and drying techniques, are essential to minimize end checking and ensure the quality of the resulting lumber.