Dycal Again

I have never lightcured Dycal. Never thought it needed curing.

Then I happened to assist a friend who cured it - and another friend who was assisting me told me that Dycal should be lightcured. Confused, I just did it. After all, an extra curing never hurt anyone.

Except I did it in front of the demonstrator.

With disdain, "Dycal is not lightcured."

Why do I always go out of the way to look like an idiot in front of my demonstrator? WHY?