Why it worked
The video likely worked due to the unexpected and messy outcome of applying nail polish to a squishy toy, creating a visually interesting and somewhat shocking "satisfying" or "gross" moment that is common on platforms like TikTok.
Product placement
OPI Nail Lacquer (nail polish) - ACTS: Used to color a squishy toy, resulting in a messy, colorful outcome. Removing it would change the outcome of the video. OPI is a brand of nail polish.