A promotional claim that epoxy paints are low-VOC and chromate-free is disingenuous. They may be good for the environment, but they may prove to be very bad for you.
Even the 'best' of filter-type full-coverage masks will not protect you from isocyanates. They are not particulates and they apparently cannot be trapped or absorbed or neutralized by a filter. To make matters worse, they are also absorbed through the skin. For proper safety protection, you need a full suit and mask-and-pumped-air system... which will set you back about $1,000.
So why are catalyzed (aka '2K','two-pack', etc) paints apparently being used by so many hobbyists without any ill effects? It appears to be a combination of two factors: personal physiology, and extent of exposure. For some people, even a one-time exposure can lead to significant long-term health problems. For others, they may simply find that they can no longer tolerate future exposure because it's not worth the symptoms they experience. For others still, the symptoms seem to be minimal (or at least temporary... or maybe just postponed until they get older).
You will hear and read many reports from people who say that they've used catalyzed paints for years with no ill effects. Those would be the people who fit into category #3. The problem is that you will not know which of the three categories you fit into until after the fact.
This video, produced by the Ontario Ministry of Labour, may be of interest...
https://www.youtube.com/watch?v=mRstojCeyEQ
Isocyanate-based paint hardener is sold at the retail level everywhere and with minimal safety warnings. I've experienced the chest-tightening symptoms and I will now only use the stuff in an open-air environment (i.e. outdoors, or with the garage door open). Others will disagree and say I'm being too cautious. I suggest you try a limited exposure to start.