Corrine, Without knowing what you are using, I can offer this: Check
the Casdaldo MSDS for Liquicast. There is sufficent caution notice
contained in their MSDS relative to aryl mercury compound. Cronic
effects : Long term exposure has been associated with central
nervous system, digestive, and kidney system disorders. Section 9
RCRA: Upon disposal, this product (uncured) is a charactaristic RCRA
hazardous waste(D009 owing to mercury content) as defined in 40 CFR
261. Cured materials may be RCRA regulated for Mercury. CA
WARNING: This product contains a chemical (Mercury) known to the
State of California to cause Birth Defects or other reproductive
harm. In most areas it is not permissable to dump Mercury Compounds
in Landfills. You need to contact your local authorities about this.
I do not use Polyurethane liquids at all. To be on the safe side, I
use only 2 part Silicones, which cost more, but are safe.