Dave.1 - Good advice from Osage (Sage = one with wisdom). After you read through the refill instructions on the Hobbicolor website plus Alotofthings and the inksupply.com sites you should read the entire section on this forum on sealing the fill hole. It is really an excellent discussion about what does and does not work well. Also, go to the top of the page and click on Neil Slade's link. Hopefully, he still has info on his very simple technique for refilling. Just don't be intimidated. It isn't rocket science.