There's no doubt that anyone who glasses a kayak or canoe in the basement is creating a lot of fumes.
I have a hot air system in my home and I have a vent opening in the basement shop area that I open to heat the area when I work there. Once I glass, I close the vent (which probably leaks a bit) I wear a mask when working with the epoxy and close the basement door and my furnace gets it's fresh air from another level of the house. I don't smell a thing upstairs and never had an adverse reaction.

The next morning when I check it out, I open the outside basement door and use the exhaust fan and blow the area out and just sacrifice the heat.

My feeling is that you are not doing this over and over and over and if that was the case you would make serious adaptations to the work space or use the garage. I think with a little caution most people can build something in the basement with no more adverse caution than painting with oil based paint.

When I varnish, I always do that in may garage.

If you have young children or allergies etc. then do your glassing in a garage with a space heater.