Our Cathodic electrodeposition (CED) coating for our steel covers has excellent corrosion resistance and is environmentally friendly.  The laser marking however doesn’t have that same corrosion resistance.  As we don’t like to see the rusted sea turtle logo on the cover we changed it to a pressed logo of COC.  The sea turtle logo is just a bit too complicated for a pressed mold. 
https://www.cocinc.cn/ssd-covers/