+2
WD-40 contains stoddard solvent, liquefied petroleum gas, mineral oil, and carbon dioxide. To be sure none of these ingredients affects the particular polymer in question you should call the manufacturer as not all polymer's are the same. My opinions are worth exactly what you paid for them, but I doubt WD-40 will have any effect at all other than making your grip a little slippery if you don't wipe it off good. Most manufacturers realize you will be using some pretty harsh chemicals when cleaning your gun so usually plan the chemistry of their polymers accordingly. I hope my comments are relevant to the question at hand.