What is driving the sharp swings in TGIC prices week to week?

What is driving the sharp swings in TGIC prices week to week?
Weekly powder coating raw material updates show TGIC moving violently in both directions. In one week the curing agent fell 800-1,000 yuan per tonne while spot stayed tight; in another it jumped 2,000-2,500 yuan per tonne, again with tight spot supply. Smaller weekly moves of 200-300 yuan have also been reported. The pattern suggests a market where physical availability, not underlying demand, sets the tone. Epoxy and polyester resins often move in the same direction, reinforcing that these swings reflect broader powder coating chain sentiment. For buyers, the practical implication is that TGIC pricing is highly volatile and spot tightness can persist even when prices are falling.