Silicone...those suckers never come loose... Found in the silicone area stuff at Walmart..comes in a little tube that you can hold in your hand, you don't need one of those silicone thing a ma bob guns...GE 100% Clear Silicone, you may not find it with those big huge tubes but it's in that area...Takes a bit to set up but well worth it...You will never ever ever have another wick base pull loose off the bottom of the jar.