First, sorry if this is the wrong forum to post this. I just changed my oil in my Mustang last night and want to send a sample to Blackstone for the Blackstone/Dyson analysis. I sent away for the kits and have them ready to go. I just wanted to know if there were any tips you could offer on sealing it up. I put the clear container cap on fairly tight. Should I tape up the outer container or anything? Or is tight good enough?