Panipak has now gone undefeated in the 49kg category for three years, 10 months and 29 days.
In Manchester, she beat Shahd Samy Elhosseiny of Egypt (2-0), Israel’s Avishag Semberg (2-0) and China’s Guo Qing (2-1) to earn a place in the final against her old foe Merve Dinçel of Turkey.
Panipak, who beat Dinçel 1-0 in the final of the previous Grand Prix event, scored a second win over the Turk with a 2-0 victory in the Manchester final.
The Thai has won all four tournaments she has entered this year.
Panipak’s last defeat came against South Korea’s Kim So-hui almost four years ago.