Abstract: A sealant applicator assembly (10) for mounting to an automatic drilling and fastener installation machine to apply sealant to the tip or shank surface of a fastener (14) before "wet" installation of the fastener into a hole. The assembly (10) includes a valve member (21) that is opened or actuated by physical movement of the fastener (14) therewith whereby sealant flows into contact with the fastener shank. Upon removal of the fastener (14) from contact with the valve members (21), valve closure takes place due to sealant pressure and sealant flow is stopped. By sequencing the sealant application onto the fastener concurrently with drilling or other hole preparation by the automatic machine, cycle time for "wet" fastener installation is minimized.