DEFENDER SiO2 Protectant is the ideal product for both professionals and enthusiast for use as a topper/maintenance treatment for Inspiration Coatings as well as other coatings or as a stand alone SiO2 Protectant. Defender SiO2 Protectant (DSP) is very easy to apply and use in most environments. Defender creates incredible gloss, slickness and durable protection. Although Defender is primarily for painted surfaces it also can be used on metal, glass and trim.