What product can I use when installing a mirror? The "regular" mastic gives off a strong oily/chemical smell that is making me sick.
The product we used is Mirror-Mastic: SuperSet™ Mirro-Mastic®. Does this product stop outgassing? How long will it take? Should we remove the mirror and start over? Is there a product that MCS people can tolerate?
First and foremost, I would not recommend installing the mirror with mastic. If you should ever want to remove the mirror, such as to paint, you will likely break the mirror in the processes of removing it as well as tearing the paper off the sheet rock, which may result in sending all materials to the land fill.
Consider using a French Cleats or traditional corner clips to hang the mirror. This is a good option for earthquake prone areas like yours.
If you are set on “gluing” the mirror then consider a Liquid Nails product such as Home Products Repair Adhesive. However, I would speak with the manufacturer with regards to the size and weight of the mirror as well as the set time for mirror glass before purchasing.