Use Permatex .20-oz Blue Threadlocker to create a tight and dependable bond. It can be used for all nut and bolt applications from 1/4" to 1" in size. The Permatex threadlocker works well for valve cover bolts, water pump bolts, oil pan bolts, drive shaft bolts, rocker arm adjustment nuts, carburetor studs and vertical applications. It creates a tight seal that prevents parts from loosening from vibration and protects the threads from corrosion. This medium strength threadlocker comes in a convenient gel form that doesn't drip, leave globs or create a mess.