I can't speak for other chapters, but Plastidip is actually recommended by our marshals. As long as the weapon meets all other safety criteria, and you apply the Plastidip properly, it would likely pass inspection.
Double-check with your local team, though, because there's always some variance between chapters.
I have made many PlastiDip weapons and shields for Oregon and San Fransisco without a single complaint. As long as they meet safety and size standards, you will be good to go.
I recommend PlastiDip Artists group on Facebook for some good guidelines on how to thin, carve, and craft. Mostly LARPers, tons of awesomeness.
And on the Youtubes, Angry Pixie Cosplay has a couple great tutorial. https://www.youtube.com/channel/UCY2fF3e0CnSchJUy8c8L7xg