(Experimentally Verified Effective)
Problem Descript_ion: Standard sealing strips are used to block holes during spraying. Paint accumulates around the thread hole opening after coating, resulting in failure to pass the go thread gauge. 
Improvement Plan 1: Manually chamfer holes with a chamfering cutter to clear paint buildup at hole edges; verification passed.
Disadvantage: Inconsistent chamfer sizes due to manual operation.
Improvement Plan 2: Switch to silicone thread plugs for hole blocking; trim excess plug material with a blade after installation.
Disadvantage: Higher material cost compared to sealing strips.
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