Others have explained well why this wouldn’t work but I’d just like to point out there’s active research into [body armor formed by impregnating a Kevlar matrix with non-Newtonian fluid](https://www.researchgate.net/publication/333824103_Bullet_Proof_Vest_using_Non-Newtonian_Fluid).
The advantage is less that there’s some magical property of these fluids that make them absolutely bulletproof, more that it’s flexible enough where you can armor awkward areas where plate armor is impractical (armpits, groin, inside elbows, etc).
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