Do not keep blasting screws into stripped spiral metal. Reset the joint, move to clean fastening points, and reseal it by the approved pressure-class method.
Do not fill stripped screw holes with mastic only and pretend the joint is mechanically fastened.
Check
Identify every stripped screw or cracked seal bead around the joint.
Check whether the sleeve/coupler is fully inserted and seated.
Remove loose fasteners and move to clean metal, not the same wallowed hole.
Use the approved screw type, spacing, and sealant system for the pressure class.
Recheck the joint during leak test or startup.
Steps
Identify every stripped screw or cracked seal bead around the joint.
Check whether the sleeve/coupler is fully inserted and seated.
Remove loose fasteners and move to clean metal, not the same wallowed hole.
Use the approved screw type, spacing, and sealant system for the pressure class.
Recheck the joint during leak test or startup.
Say this to your foreman
The spiral coupler at [location] has stripped screw holes and a cracked seal. I stopped running the impact on it. Do you want the joint reset with fresh fastener points and resealed per pressure class?