Which method is least effective in finishing a gunstock?

Using low-quality finishing oils is considered the least effective method for finishing a gunstock because these oils often do not provide adequate protection or durability. High-quality finishes are essential in woodworking, especially for items like gunstocks that are exposed to varying environmental conditions. Low-quality oils may not penetrate deeply into the wood or might require frequent reapplication, resulting in inadequate sealing against moisture and wear.

In contrast, hand sanding and machine sanding serve to prepare the wood surface effectively, ensuring a smooth finish that enhances the overall appearance and feel. Application of varnish provides a robust protective coating that can withstand scratches and moisture, significantly improving the longevity of the finish. Thus, while all methods have their applications, using low-quality finishing oils fails to meet the necessary standards for a project like finishing a gunstock.