New Genuine Yamaha Yamalube Yamabond 4 Liquid Gasket (2-Pack) A silicone-based liquid gasket that fills gaps on a flange surfaces. When cured (sets in 60 minutes), this product forms a rubber-like gasket that resists high temperatures, seals joints, and offers gear- and engine-oil resistance. Product should be used where Threebond® 1215 is specified in service manual.