Epoxy PrimerOn this forum I've indicated that epoxy primer (typically PPG OMNI MP170 that I use - more specifically the MP175 catalyst that is required to be added to it) does not contain isocyanates and therefore a supplied-air respiratory system is not necessary. I believed, and have implied, that is also true of other automotive epoxy primers. I have now run across an epoxy primer that does have isocyanates in the required additive (referred to as a "hardener" rather than a catalyst). The tech sheet for that primer is here and the MSDS for the required "hardener" is here. Conclusion: To be sure about the presence of isocyanates, you must check the manufacturer's specific MSDS (Material Safety Data Sheet) that applies to each of the mixed products. The isocyanate compounds, if present, will typically show up in the MSDS for the additive, and it may not matter if that additive is referred to as a catalyst, a hardener, an activator or something else. Manufacturers are required by law to identify all hazardous ingredients in their products by the use of MSDS. Employers are also required to make the appropriate MSDS readily available (for free) to all employees who come in contact with products in the workplace. Individuals and DIYs can, and should, make good use of such information since much of it is now available at manufacturer's websites.  Rod
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