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!
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2013 VW Passat TDI SE, 16,100miles
2014 VW Jetta TDI SportWagen 2350 miles