Adhesives FAQs Summary Are RTV silicones paintable? The short answer is no. They generally are too viscous. What kind of adhesion promoter is the best for my application? View our primer guide below. 2-Part RTV silicones Generally, two-part RTV silicone products do not have adhesion promoters in their formulation and consequently have minimal adhesion to substrates. Two-part products have adhesion that is usually acceptable for potting or encapsulating applications but is not sufficient for many sealing or adhering applications. If better adhesion is required, a primer can be used. 1-Part RTV silicones One-part RTV silicone products have adhesion promoters in their formulation and co nsequently have good adhesion to a variety of substrates. For 1-part products, it is generally suggested that testing be done without a primer first and if adhesion is acceptable then no primer is required. Available primers SS4044P General purpose, clear, can be used in food contact applications where FDA regulations apply. Meets MIL-A-46106B, MIL-A-46146A, MIL-A-46146B, MIL-S-23586E. SS4120 Clear, most suitable when optical clarity is required, can be used in food contact applications where FDA regulations apply. Meets MIL-A-46106B, MIL-A-46146B. SS4155 General purpose, blue, forms chalky white haze when dry What kind of cure type is best for my applications? If corroson is a concern the following cure types will pose no problem : – Neutral cure – Alkoxy neutral cure – Modified alkoxy neutral cure How do I remove RTV silicones once they have cured? A combination of physical scraping and a strong solvent works best.