John,<br><br>So far the vaseline has not moved out of the straw. However, I made these in probably February, and like Tom noted, they have not been exposed to any high temperatures. <br><br>I put 3 of these in the hollow handle of my CReeve knife along with a BSA Hot Spark. Any migration of the vaseline here will not matter. <br><br>I placed 2 in my PSK, which rides in my daily carry bag 90% of the time and in my shirt pocket occasionally. I opened this today....lots of tape, and there was no mess in there either. I took the precaution of placing these straws in pieces of "dry" cotton balls that I have used as anti-rattle firestarting stuffing (ARFS). Any migration should cause no harm. My cotton was by no means soaking in vaseline. <br><br>I will watch these over the summer to see if sealing would be a good idea, but I really do not anticipate having to do much.<br>