What you really have to be sure of is that your wick pins are, guess you would call it concave to fit the "top" of your mold. I got some that were straight on the bottom and they don't work. I use wick pins on the outside also. I got this light gray sealer stuff, don't remember what it was called, years ago. Probably from either GenWax or Candlewic. It comes in narrow strips maybe 1/2" or little less and rolled up with a strip of paper between each. Put some around bottom of wick pin and press hard and it will last for ages with no leaks. Hope I can find more when I give out but think that will be a long time off it last so good.