The crucial question of law in WatsonSeal’s lawsuit against Crawlspace Ninja for allegedly violating the Lanham Act with false advertising about its polymer sealant, LumberKote, was whether an educational video Crawlspace posted on its YouTube channel was “commercial speech” — either “core” or “non-core,” a variety that “has no clear-cut definition.”Crawlspace, which sells a sealant called Anabec x70, disagrees with WatsonSeal’s claim that LumberKote can be applied to wood that’s still wet. The video shows moldy lumber …