Greetings to you Joe!

Have been reading you for some time and thought I’d bounce a Proposition 65 question off of you. Do you know if the need for Prop 65 warning labels in California are required “after” powder paint cures? The cured mixture is now hard as a rock. Do we need labels now that the powder is cured?

Thanks so much for your input,


Vernon Plumlee, San Dimas, California


Hi Vern,

Thank you for your question - it's a good one. Powder coatings commonly contain materials that are on California's Proposition 65 list, namely titanium dioxide, carbon black pigment, 2-methyl imidazole and TGIC (triglycidyl isocyanurate). These present health hazards in the respirable particle form, but not when they are bound in a hardened film. So, there is not a need for a Prop 65 hazard label for items that are coated (and cured) with powder coatings.

Hope that this helps,


Best regards,

Joe Powder