Momentive's SS4155 is a primer formulated for use with Momentive Performance Materials (MPM) RTV silicone rubber adhesive sealants. MPM one-component products offer primerless adhesion to many substrates. In contrast, MPM two-component products require a primer when an adhesive bond is needed between the silicone rubber compound and a non-silicone surface. SS4155 is used to help promote adhesion to difficult-to-bond substrates. It is also, like other SS- primers, one-component, requires no mixing, and is supplied ready-to-use as an easily pourable solvent solution. Moreover, SS4155's recommended use is with the following silicone rubber compounds: RTV11 through 88, RTV500 series, RTV615, 655, and RTV61X6 series. It's important to note, however, the key advantage to this particular SS- primer is its versatility, as it can be used with all RTVs. Check the features and specs for more details as well as the MSDS for safe use of this item.