Spray the silicone spray on a styrofoam coffee cup. If the cup dissolves quickly, this is not something that is safe around plastics or rubber. For long term safety around rubber, use a pure silicone spray or the grease as mentioned above. You would be surprised at the number of silicone sprays that will fail the cup test!
2013 VW Passat TDI SE, 36,800 miles
2014 VW Jetta TDI SportWagen 19,455 miles