Excellent point, and thanks for bringing the subject of industrial hygiene into perspective! As a former military aviation safety officer, I should have made these points below from past and present experiences...For you novices, some warnings. Epoxy typically carries some sensitizing agents, that can make you allergic to your airplane. Yes, some more recent epoxies are lower sensitizing, but they are not non-sensitizing, while others are even worse than the epoxies of old...
The guy leading you through the processes wore "invisible gloves", a barrier material, on his hands to allow what looked like bare hand work with the epoxy. Many folks have used it, others are just religious about nitrile gloves. Either way, protection against absorption of epoxy through the skin is a wise precaution.
Next, some small amount of the epoxy will evaporate, and usually some amount is also a sensitizer. Folks, either really good ventilation or a respirator with filters for organic vapor capture is a good idea, or you can again become sensitized (allergic to) your airplane.
There are airplane projects out there that were partially built,and then abandoned, sold, given away, etc, because the builder became allergic to it. Do not be that guy. Please protect yourself from breathing epoxy vapors or absorbing epoxy through your skin.
I hated latex gloves, so at the beginning of my experiences with epoxies, I never used anything. Then I got wise to the dangers of the materials and eventually became religious about shop safety, ventilation, PPE and the like.
I am not a fan of Ply-9, but my go-to are nitrile gloves, respirator and eye protection at all times.
Also, in that older video, I darn near cringed when I saw that hotwire power source setup without any protection around it. What you saw in the video is a setup for electric shock!!
Here are some tips on epoxies for those not in the know!
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