Beneficiall, put the cans in some warm water before spraying. Make sure the parts are clean AND dry. Maybe great up lightly with a heat gun if you can do so without melting the chrome plastic. Just because you don't see the moisture doesn't mean it's not there. You'd know if you ever try to weld metal without preheating it in winter months.
702_AveoLT, I'm digging the retrofits. Did you make those or pay someone else to make them?