I was wondering when someone would get around to looking at this. I work in the marine field and if you've ever spent time in a boat yard you know about making dust. Sanding fibreglass, gelcoat, paint, varnish, bottom coat...

Fiberglass is durable and very slow to break down, especially if it’s reinforced with plastic

I don't know many manufacturers building un-reinforced fiberglass boats. The product is actually GRP- Glass Reinforced Plastic, fiberglass is an ingredient. Slop article.