NET0331- Gasket Sealer, Maker "Permatex Aviation Form A Gasket" 4oz. This is great stuff and what we use here for all NON metallic gaskets and other uses. We love it! Seals but stays softy and pliable allowing it to continue to seal. Also tacky so it helps keep gaskets in place for install. Many use it for hose and thread sealing as well.  
 
Permatex Aviation Form-A-Gasket No. 3 Sealant is a slow-drying, non-hardening brush-top sealant approved for use in aviation as well as automotive applications. Gasoline, oil and grease resistant, it has a temperature range of -65 degrees fahrenheit to 400 degrees fahrenheit. Suggested applications include close-fitting machined surfaces, sealing hoses, and solid gaskets. When a chemical gasket is not an option, Permatex offers a wide range of gasket sealants suitable for applications on both import and domestic vehicles of any model year or performance caliber.
 
NOTE- We offer quality tools at fair prices, often many of these tools we use here or at the least tested them first hand and have been very happy with the quality and performance! That said they are offered with affordability and ease of use in mind for the "do it yourself-er" " they are not professional tools meant for 10 hours a day 7 days a week but are also a tenth of the cost of most of those caliber tools.  Finish/appearance, markings etc may very. ALWAYS PRACTICE SAFE PROCEDURES AND USE PROTECTIVE GEAR