I use the West System because I am very familiar with it from building stripper canoes and repairing a few older wooden boats. By no means an expert. Being familiar with a product makes the construction so much easier. That being said I have many friends and acquaintances that use nothing but the hobby epoxies and get great results. We indeed are most fortunate to have so many options. We don’t put our butts in these things so insisting on certified epoxy and techniques is a bit much. If your doing what the plans/instructions call out and its working your doing it correct no mater what the experts say. It’s a hobby, experts and their opinions are sometimes way over kill.
Dennis