The implementation of friction stir welding (FSW) as a rivet replacement technology has drawn a tremendous interest from the aerospace industry in recent years.  The traditional riveting process is labor intensive and costly.  Moreover, mechanical properties of FSW lap joints are superior to the riveted ones.  However, the inherent issue of crevice corrosion in FSW lap joints must be resolved before FSW lap joining can be fully implemented on aircraft structures.  A desirable approach to this problem is to apply an adhesive or sealant between two metal sheets prior to FSW to act as a sealant and improve overall lap-joint performance.  In this program, FSW lap joining with a sealant was conducted on 0.080-in. (2 mm) thick AA7075-T7 sheet.  The sealant was applied in two ways: in the weld path and adjacent to the weld path.  FSW lap welding was carried with both a cured and uncured.  The presence of sealant at or between the welds has little effect on the resulting joint strengths.  No crevice corrosion was observed at the faying surfaces of all FSW lap joints after exposure to salt fog spray for 500 hr.  This feasibility study has shown promising results for resolving the inherent crevice corrosion issue for brining FSW lap joints into production.