You may want to consider a respirator with this stuff too. I use small amounts when mixing to thicken up the epoxy for structural/reinforcing fillets on my rockets. Anytime I haven't used this stuff for a good while and have forgotten - the first time I exhale after taking a spoonful of this stuff out of the container, I remember pretty quickly to hold my breath until I'm able to mix it in. He is right, though... Stuff is very light! But I don't use anywhere near enough to justify a 10lb bag.
-Mike