For a comparison here is the SDS for a Polyurethane sealant that people often use on reptile enclosure: http://www.menards.com/msds/104436_001.pdf

It has a health rating of 2 with a flash point of 101 F (before cure). So according to the SDS the polyacrylic is twice as toxic.

In both cases you're using the product for something other than it's intended use, but SDS sheets tend to mean business.